# java029

**Repository Path**: m1n9/java029

## Basic Information

- **Project Name**: java029
- **Description**: No description available
- **Primary Language**: Java
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2017-02-26
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

#java029
package hello;
import java.util.*;
public class omg {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		ArrayList<String> array = new ArrayList(100);
		String num = null;
		String num2 = null;
		System.out.println("请输入你想要输入的数字：");
		num = s.next();
		num2 = s.next();
		
		
	}

}




package hello;
import java.util.*;
enum Grade
{
	A,B,C,D,E;
}
public class rng {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in=new Scanner(System.in);
		for(int z=0;;z++){
			int grade=in.nextInt();
			Grade test=getGrade(grade);
			switch(test)
			{
			case A:
			{
				System.out.println("Excellent");
				printGradeInfo(test);
				break;
			}
			case B:
			{
				System.out.println("Good");
				printGradeInfo(test);
				break;
			}
			case C:
			{
				System.out.println("Average");
				printGradeInfo(test);
				break;
			}
			case D:
			{
				System.out.println("Fair");
				printGradeInfo(test);
				break;
			}
			case E:
			{
				System.out.println("Poor");
				printGradeInfo(test);
				break;
			}
			}
		}
	}
	
	static Grade getGrade(int score){
	if(score<=100&&score>=90) return Grade.A;
	else if(score<90&&score>=80) return Grade.B;
	else if(score<80&&score>=70) return Grade.C;
	else if(score<70&&score>=60) return Grade.D;
	else return Grade.E;
	}
	
	public static void printGradeInfo(Grade grade){
	       System.out.println("class name="+Grade.class);
	       System.out.println("grade value="+grade);
	}
}


package hello;
import java.math.BigDecimal;
import java.util.*;
public class helloworld {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
    Scanner s=new Scanner(System.in);
    while(true){
    	BigDecimal b1 =new BigDecimal(s.next());
    	BigDecimal b2 =new BigDecimal(s.next());
    	BigDecimal b=b1.add(b2);
    	BigDecimal c=b1.multiply(b2);
    	System.out.println(b);
    	System.out.println(c);
    }
	}
}



3=1
import java.util.*;
class Person{
	private String name;
	private boolean gerder;
	private int age;
	private int id;
	
public Person(){
	System.out.println("This is constructor");
	System.out.println(name+","+age+","+gerder+","+id);
}

public Person(String name,int age,boolean gerder){
	this.name=name;
	this.age=age;
	this.gerder=gerder;
	//this.id=id;
}

public void setName(String name){
	this.name=name;
}
public String getName(){
	return name;
}

public void setAge(int age){
	this.age=age;
}
public int getAge(){
	return age;
}
public void setGerder(boolean gerder){
	this.gerder=gerder;
}
public boolean getGerder(){
	return gerder;
}
public int getId(){
	return id;
}



public String toString(){
	return String.format("Person [name=%s, age=%d, gender=%s, id=%d]",name,age,gerder,id);
}


}
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//Person p=new Person("zheng",15,true,0);
		//System.out.println(p);
		Scanner in=new Scanner(System.in);
		int n=Integer.parseInt(in.nextLine());
		Person[] persons=new Person[n];
		for(int j=0;j<persons.length;j++){
			Person person1=new Person(in.next(),in.nextInt(),in.nextBoolean());
			persons[j]=person1;
		}
		for(int i=persons.length-1;i>=0;i--){
			System.out.println(persons[i]);
			//System.out.println(new Person());
		}
		System.out.println(new Person());
	}
}




3-2
package java03;
import java.util.*;
class Person{
	private String name;
	private boolean gender;
	private int age;
	private int id;
	static int a=0;
	{
		id=a++;
		System.out.println("This is initialization block,id is"+id);
	}
	static{
		System.out.println("/nThis is static initialization block");
	}
	public Person(){
	System.out.println("This is constructor");
	System.out.println(name+","+age+","+gender+","+id);
	}
	public Person(String name,int age,boolean gender){
		this.name=name;
		this.gender=gender;
		this.age=age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public boolean isGender() {
		return gender;
	}
	public void setGender(boolean gender) {
		this.gender = gender;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String toString(){
		return String.format("Person[name=%s,age=%d,gerder=%s,id=%d]",name,age,gender,id);
	}
	}




public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in=new Scanner(System.in);
		int n=Integer.parseInt(in.nextLine());
		Person[]persons=new Person[n];
		for(int i=0;i<persons.length;i++){
			Person person=new Person(in.next(),in.nextInt(),in.nextBoolean());
			persons[i]=person;
		}
		for(int i=persons.length-1;i>=0;i--){
			System.out.println(persons[i]);
		}
		System.out.println(new Person());
		in.close();
	}

}


jmu-Java-03-面向对象1-基础-封装继承 5-4

package studythree;

import java.util.*;

abstract class Shape
{
	double PI=3.14;
	abstract double getArea();
	abstract double getPerimeter();
}

class Rectangle  extends Shape
{
	  public double width; 
	  public double height; 

	  Rectangle(double w, double h){
	      width = w; 
	      height = h;
	  }


	public double getWidth() {
		return width;
	}

	public void setWidth(double width) {
		this.width = width;
	}

	public double getHeight() {
		return height;
	}

	public void setHeight(double height) {
		this.height = height;
	}

	public double getPerimeter()
	{
		return 2*(width+height);
	}
	
	public double getArea(){
	      return width*height;
	  }


	@Override
	public String toString() {
		return "Rectangle [width=" + width + ", height=" + height + "]";
	}
}

class Circle extends Shape{
    public double r; 

    Circle(double r){
        this.r = r;          
    }

    public double getR() {
		return r;
	}

	public void setR(double r) {
		this.r = r;
	}

	public double getArea(){
        return PI*r*r;
    }

	public double getPerimeter()
	{
		return 2*r*PI;
	}
	
	@Override
	public String toString() {
		return "Circle [r=" + r + "]";
	}
	
}

public class Cd 
{
	public static void main(String[] args)
	{
		Scanner in=new Scanner(System.in);
		for(int z=0;;z++)
		{
			Cd main=new Cd();
			int i;
			int n=in.nextInt();
			String str=in.nextLine();
			Shape[] shape=new Shape[n];
			for(i=0;i<n;i++){
				if(str.equals("rect"))
				{
					Shape a=new Rectangle(in.nextInt(),in.nextInt());
					shape[i]=a;
				}
				else if(str.equals("cir"))
				{
					Shape b=new Circle(in.nextInt());
					shape[i]=b;
				}
			}
			
			System.out.println(main.sumAllPerimeter(shape));
			System.out.println(main.sumAllArea(shape));
			System.out.println(Arrays.deepToString(shape));
			System.out.println(shape.getClass());
			System.out.println(shape.getClass().getSuperclass());
		}
	}
	public double sumAllArea(Shape[] shape)
	{
		int i;
		double t=0;
		for(i=0;i<shape.length;i++)
		{
			t=t+shape[i].getArea();
		}
		return t;
	}
	
	public double sumAllPerimeter(Shape[] shape)
	{
		int i;
		double t=0;
		for(i=0;i<shape.length;i++)
		{
			t=t+shape[i].getPerimeter();
		}
		return t;
	}
}

jmu-Java-03-面向对象1-基础-封装继承 5-5
package studythree;

import java.util.Arrays;
import java.util.Scanner;

class PersonOverride
{
	private String name;
	private int age;
	private boolean gender;
	public PersonOverride(String name,int age,boolean gender)
	{
		this.name=name;
		this.age=age;
		this.gender=gender;
	}
	public PersonOverride()
	{
		this("default",1,true);
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public boolean isGender() {
		return gender;
	}
	public void setGender(boolean gender) {
		this.gender = gender;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "PersonOverride [name=" + name + ", age=" + age + ", gender=" + gender + "]";
	}
	public boolean equals(PersonOverride another)
	{
		 if (this == another)  return true;
	     if(another instanceof PersonOverride) 
	     {
	    	 if((this.name==another.name)&&(this.age==another.age)&&(this.gender==another.gender)) return true;
	    	 else return false;
	     }
	     else return false;
	}
}


jmu-Java-03-面向对象1-基础-封装继承 5-3
public class Ce {
	public static void main(String[] args) {
		Scanner in=new Scanner(System.in);
		int i,t=0,w=0;
		int n1=in.nextInt();
		int n2=in.nextInt();
		PersonOverride[] person1=new PersonOverride[n1];
		PersonOverride[] person2=new PersonOverride[n2];
		for(i=0;i<n1;i++)
		{
			PersonOverride a=new PersonOverride();
		}
		for(i=0;i<n2;i++)
		{
			PersonOverride a=new PersonOverride(in.nextLine(),in.nextInt(),in.nextBoolean());
			for(int j=0;j<i;j++)
			{
				if(a.equals(person2[j])) t=1;
			}
			if(t==0) 
			{
				person2[i]=a;
				w++;
			}
			else if(t==1)
			{
				person2[i]=new PersonOverride();
			}
		}
		System.out.println(Arrays.deepToString(person1));
		System.out.println(Arrays.deepToString(person2));
		System.out.println(w);
		System.out.println(Arrays.toString(PersonOverride.class.getConstructors()));
	}

}







package studythree;
import java.util.*;
public class Shapr01 {
	public static void main(String[] args) {
		int add=0,sum=0;
		Scanner in=new Scanner(System.in);
		Rectangle[] chang=new Rectangle[2];
		Circle[] yuan=new Circle[2];
		for(int i=0;i<2;i++){
			Rectangle a=new Rectangle(in.nextInt(),in.nextInt());
			chang[i]=a;
			add=add+chang[i].getPerimeter();
			sum=sum+chang[i].getArea();
		}
		for(int i=0;i<2;i++){
			Circle b=new Circle(in.nextInt());
			yuan[i]=b;
			add=add+yuan[i].getPerimeter();
			sum=sum+yuan[i].getArea();
		}
		System.out.println(add);
		System.out.println(sum);
		System.out.println(Arrays.deepToString(chang));
		System.out.println(Arrays.deepToString(yuan));
	}
}


class Rectangle{
	private int width;
	private int length;
	
	Rectangle(int width,int length){
		this.width=width;
		this.length=length;
	}

	public int getWidth() {
		return width;
	}

	public void setWidth(int width) {
		this.width = width;
	}

	public int getLength() {
		return length;
	}

	public void setLength(int length) {
		this.length = length;
	}

	@Override
	public String toString() {
		return "Rectangle [width=" + width + ", length=" + length + "]";
	}
	
	public int getPerimeter(){
		return 2*(width+length);
	}
	
	public int getArea(){
		return width*length;
	}
}



class Circle{
	
	private int radius;

	Circle(int radius){
		this.radius=radius;
	}
	
	public int getRadius() {
		return radius;
	}

	public void setRadius(int radius) {
		this.radius = radius;
	}

	@Override
	public String toString() {
		return "Circle [radius=" + radius + "]";
	}
	
	public int getPerimeter(){
		return (int)Math.PI*2*radius;
	}
	
	public int getArea(){
		return (int)(Math.PI*radius*radius);
	}
}





jmu-Java-03-面向对象1-基础-封装继承 5-4

package studythree;
import java.util.*;
public class Shape01{
	public static void main(String[] args) {
		double add=0,sum=0;
		String h="rect";
		String j="cir";
		Scanner in=new Scanner(System.in);
		int a=in.nextInt();
		Shape[] rng=new Shape[a];
		for(int i=0;i<a;i++){
			String b=in.next();
			if(b.equals(h)){
				Rectangle omg=new Rectangle(in.nextInt(),in.nextInt());
				rng[i]=omg;
				add=add+rng[i].getPerimeter();
				sum=sum+rng[i].getArea();
			}
			if(b.equals(j)){
				Circle edg=new Circle(in.nextInt());
				rng[i]=edg;
				add=add+rng[i].getPerimeter();
				sum=sum+rng[i].getArea();
			}			
		}
		System.out.println((double)add);
		System.out.println((double)sum);
		System.out.println(Arrays.deepToString(rng));
		for(int i=0;i<a;i++){
	        System.out.print(rng[i].getClass()+",");
	        System.out.println(rng[i].getClass().getSuperclass());
		}
		/*Rectangle[] chang=new Rectangle[2];
		Circle[] yuan=new Circle[2];
		for(int i=0;i<2;i++){
			Rectangle a=new Rectangle(in.nextInt(),in.nextInt());
			chang[i]=a;
			add=add+chang[i].getPerimeter();
			sum=sum+chang[i].getArea();
		}
		for(int i=0;i<2;i++){
			Circle b=new Circle(in.nextInt());
			yuan[i]=b;
			add=add+yuan[i].getPerimeter();
			sum=sum+yuan[i].getArea();
		}
		System.out.println(add);
		System.out.println(sum);
		System.out.println(Arrays.deepToString(chang));
		System.out.println(Arrays.deepToString(yuan));*/
	}
}

abstract class Shape{
	final double PI=3.14;
	public abstract double getPerimeter();
	public abstract double getArea();
}

class Rectangle extends Shape{
	private int width;
	private int length;
	
	Rectangle(int width,int length){
		this.width=width;
		this.length=length;
	}

	public int getWidth() {
		return width;
	}

	public void setWidth(int width) {
		this.width = width;
	}

	public int getLength() {
		return length;
	}

	public void setLength(int length) {
		this.length = length;
	}

	@Override
	public String toString() {
		return "Rectangle [width=" + width + ", length=" + length + "]";
	}
	
	public double getPerimeter(){
		return 2*(width+length);
	}
	
	public double getArea(){
		return width*length;
	}
}



class Circle extends Shape{
	
	private int radius;

	Circle(int radius){
		this.radius=radius;
	}
	
	public int getRadius() {
		return radius;
	}

	public void setRadius(int radius) {
		this.radius = radius;
	}

	@Override
	public String toString() {
		return "Circle [radius=" + radius + "]";
	}
	
	public double getPerimeter(){
		return PI*2*radius;
	}
	
	public double getArea(){
		return PI*radius*radius;
	}
}


jmu-Java-03-面向对象1-基础-封装继承 5-4
package studythree;
import java.util.*;
public class Shape01{
	public static void main(String[] args) {
		double add=0,sum=0;
		String h="rect";
		String j="cir";
		Scanner in=new Scanner(System.in);
		int a=in.nextInt();
		Shape[] rng=new Shape[a];
		for(int i=0;i<a;i++){
			String b=in.next();
			if(b.equals(h)){
				Rectangle omg=new Rectangle(in.nextInt(),in.nextInt());
				rng[i]=omg;
				add=add+rng[i].getPerimeter();
				sum=sum+rng[i].getArea();
			}
			if(b.equals(j)){
				Circle edg=new Circle(in.nextInt());
				rng[i]=edg;
				add=add+rng[i].getPerimeter();
				sum=sum+rng[i].getArea();
			}			
		}
		System.out.println((double)add);
		System.out.println((double)sum);
		System.out.println(Arrays.deepToString(rng));
		for(int i=0;i<a;i++){
	        System.out.print(rng[i].getClass()+",");
	        System.out.println(rng[i].getClass().getSuperclass());
		}
		/*Rectangle[] chang=new Rectangle[2];
		Circle[] yuan=new Circle[2];
		for(int i=0;i<2;i++){
			Rectangle a=new Rectangle(in.nextInt(),in.nextInt());
			chang[i]=a;
			add=add+chang[i].getPerimeter();
			sum=sum+chang[i].getArea();
		}
		for(int i=0;i<2;i++){
			Circle b=new Circle(in.nextInt());
			yuan[i]=b;
			add=add+yuan[i].getPerimeter();
			sum=sum+yuan[i].getArea();
		}
		System.out.println(add);
		System.out.println(sum);
		System.out.println(Arrays.deepToString(chang));
		System.out.println(Arrays.deepToString(yuan));*/
	}
}

abstract class Shape{
	final double PI=3.14;
	public abstract double getPerimeter();
	public abstract double getArea();
}

class Rectangle extends Shape{
	private int width;
	private int length;
	
	Rectangle(int width,int length){
		this.width=width;
		this.length=length;
	}

	public int getWidth() {
		return width;
	}

	public void setWidth(int width) {
		this.width = width;
	}

	public int getLength() {
		return length;
	}

	public void setLength(int length) {
		this.length = length;
	}

	@Override
	public String toString() {
		return "Rectangle [width=" + width + ", length=" + length + "]";
	}
	
	public double getPerimeter(){
		return 2*(width+length);
	}
	
	public double getArea(){
		return width*length;
	}
}



class Circle extends Shape{
	
	private int radius;

	Circle(int radius){
		this.radius=radius;
	}
	
	public int getRadius() {
		return radius;
	}

	public void setRadius(int radius) {
		this.radius = radius;
	}

	@Override
	public String toString() {
		return "Circle [radius=" + radius + "]";
	}
	
	public double getPerimeter(){
		return PI*2*radius;
	}
	
	public double getArea(){
		return PI*radius*radius;
	}
}







jmu-Java-04-面向对象2-进阶-多态、接口与内部类 5-1

import java.util.*;
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in=new Scanner(System.in);
		int n=in.nextInt();
		PersonSortable[] person=new PersonSortable[n];
		PersonSortable[] a=new PersonSortable[1];
		for(int i=0;i<n;i++){
			person[i]=new PersonSortable(in.next(),in.nextInt());
		}
		
		Arrays.sort(person);
		
		for(int i=0;i<n;i++){
			System.out.println(person[i]);
		}
		System.out.println(Arrays.toString(PersonSortable.class.getInterfaces()));
		/*for(int i=0;i<n;i++){
			int x=person[i].compareTo(person[i+1]);
			if(x==1){
				a[0]=person[i+1];
				
			}
			}*/
		}
	}


class PersonSortable implements Comparable<PersonSortable>{
	private String name;
	private int age;
	
	public PersonSortable(String name,int age){
		this.name=name;
		this.age=age;
	}
	public String toString(){
		return  name + "-" + age ;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	@Override
	public int compareTo(PersonSortable o) {
		// TODO Auto-generated method stub
		int x=this.name.compareTo(o.name);
		if(x!=0) return x;
		return this.getAge()-o.getAge();
		
	}
}

jmu-Java-04-面向对象2-进阶-多态、接口与内部类 5-1
import java.util.*;
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in=new Scanner(System.in);
		int n=in.nextInt();
		PersonSortable[] person=new PersonSortable[n];
		PersonSortable[] a=new PersonSortable[1];
		for(int i=0;i<n;i++){
			person[i]=new PersonSortable(in.next(),in.nextInt());
		}
		
		Arrays.sort(person);
		
		for(int i=0;i<n;i++){
			System.out.println(person[i]);
		}
		System.out.println(Arrays.toString(PersonSortable.class.getInterfaces()));
		/*for(int i=0;i<n;i++){
			int x=person[i].compareTo(person[i+1]);
			if(x==1){
				a[0]=person[i+1];
				
			}
			}*/
		}
	}


class PersonSortable implements Comparable<PersonSortable>{
	private String name;
	private int age;
	
	public PersonSortable(String name,int age){
		this.name=name;
		this.age=age;
	}
	public String toString(){
		return  name + "-" + age ;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	@Override
	public int compareTo(PersonSortable o) {
		// TODO Auto-generated method stub
		int x=this.name.compareTo(o.name);
		if(x!=0) return x;
		return this.getAge()-o.getAge();
		
	}
}


04 5 -2

import java.util.*;


class PersonSortable2 {
	private String name;
	private int age;
	public PersonSortable2(String name,int age)
	{
		this.name=name;
		this.age=age;
	}
	
	public String getName() {
		return name;
	}

	public void setName() {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge() {
		this.age = age;
	}

	@Override
	public String toString() {
		return  name + "-" + age ;
	}

}

class NameComparator implements Comparator<PersonSortable2>{

	@Override
	public int compare(PersonSortable2 o1, PersonSortable2 o2) {
		int n;
		n=o1.getName().compareTo(o2.getName());
		if(n!=0) return n;
		else return 0;
	}
	
}

class AgeComparator implements Comparator<PersonSortable2>{

	@Override
	public int compare(PersonSortable2 o1, PersonSortable2 o2) {
		int n;
		n=o1.getAge()-o2.getAge();
		return n;
	}
	
}

public class Main {

	public static void main(String[] args) {
		Scanner in=new Scanner(System.in);
		int n;
		n=in.nextInt();
		PersonSortable2[] person=new PersonSortable2[n];
		for(int i=0;i<n;i++){
			PersonSortable2 person1=new PersonSortable2(in.next(),in.nextInt());
			person[i]=person1;
		}
		System.out.println("NameComparator:sort");
		Arrays.sort(person,new NameComparator());
		for(int i=0;i<n;i++)
		{
			System.out.println(person[i]);
		}
		System.out.println("AgeComparator:sort");
		Arrays.sort(person,new AgeComparator());
		for(int i=0;i<n;i++)
		{
			System.out.println(person[i]);
		}
		System.out.println(Arrays.toString(NameComparator.class.getInterfaces()));
		System.out.println(Arrays.toString(AgeComparator.class.getInterfaces()));
	}

}



集合
5-3
import java.util.*;
import java.util.Map.Entry;

public class Main{
	public static void main(String[] args) {
		Map<String,Integer> map= new HashMap<String,Integer>();
		String line;
		Scanner in=new Scanner(System.in);
		while(in.hasNext()){
			String key=in.next();
			Integer cnt=map.get(key);
			if(key.equals("!!!!!")) break;
			if(cnt==null){
				map.put(key, 1);
			}
			else{
				map.put(key, cnt+1);
			}
		}
		System.out.println(map.size());
		

		
		List<Map.Entry<String, Integer>> entryList = new ArrayList(map.entrySet());
		
		Collections.sort(entryList,new Comparator<Map.Entry<String, Integer>>(){

			@Override
			public int compare(Entry<String, Integer> o1, Entry<String, Integer> o2) {
				// TODO Auto-generated method stub
				if(o2.getValue()==o1.getValue())
					return o1.getKey().compareTo(o2.getKey());
				else
				return o2.getValue()-o1.getValue();
			}
			 
		});
		for(int i=0;i<10;i++){
			System.out.println(entryList.get(i));
		}
	} 
}              




4-1 异常
catch(NumberFormatException e){
	            	System.out.println("number format exception");
	            	System.out.println(e);
	            }catch(IllegalArgumentException e){
	            	System.out.println("illegal argument exception");
	            	System.out.println(e);
	            }catch(Exception e){
	            	System.out.println("other exception");
	            	System.out.println(e);
	            }

4-3 线程
new Thread(new Runnable(){
        	public void run(){
        		System.out.println(mainThreadName);
        		System.out.println(Thread.currentThread().getName());
        		System.out.println(Arrays.toString(getClass().getInterfaces()));
        	}
        });


4-5 public synchronized void deposit(int money){
		this.balance=this.getBalance()+money;
	}
	
	public synchronized void withdraw(int money){

		try{
			while(this.getBalance()<=0)
				wait();
				
			notify();
		}catch(Exception e){
			System.out.println(e);
		}
		this.balance=this.getBalance()-money;


import java.util.Scanner;
import java.util.regex.Pattern;



public class checkNumber {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
      Scanner in =new Scanner(System.in);
      while(in.hasNext()){
      String str=in.nextLine();
      System.out.println(checknumber(str));
      }
	}

	public static boolean checknumber(String str) {
		
		String patternString ="[+-]?[0-9]+";
		return Pattern.matches(patternString, str);
	}

}



package wangluo;

import java.io.*;
import java.net.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;

public class MenuServer {
	public static void main(String[] args) {
		try
	      {  
	         int i = 1;
	         
	        
	         
	         
	         ServerSocket s = new ServerSocket(8190);
	         while (true)
	         {  
	            Socket incoming = s.accept();
	            System.out.println("Spawning " + i);
	            Runnable r = new ThreadedEcho(incoming);
	            Thread t = new Thread(r);
	            t.start();
	            i++;
	         }
	      }
	      catch (IOException e)
	      {  
	         e.printStackTrace();
	      }
	}
}

class ThreadedEcho implements Runnable
{ 
   private Socket incoming;
   
   public ThreadedEcho(Socket i)
   { 
      incoming = i; 
   }

   public void run()
   {  
      try
      {  
         try
         {
            InputStream inStream = incoming.getInputStream();
            OutputStream outStream = incoming.getOutputStream();
            Scanner in = new Scanner(inStream);         
            PrintWriter out = new PrintWriter(outStream, true /* autoFlush */);
            
            
            out.println( "输入menu，选择菜单" );
            out.println( "输入quit，退出服务器" );
            out.flush();
            
            
            
            boolean done = false;
            
            
            
           
            while (!done && in.hasNextLine())
            {  
            	
               
               boolean xline=true;//退出菜单的标识
               String line = in.nextLine();            
               if (line.trim().equals("quit")){
            	   out.println();
            	   out.println("断开连接");
            	   done = true;
               }
                  
               else if(line.equals("menu")){
            	   while(xline){
            		   out.println();
            		   
            		   
            		   
            		   
            		   
            		   out.println( "1.显示服务器当前时间  " );
                	   out.println( "2.您的IP " );
                	   out.println( "3.文件搜索" );
                	   out.println( "4.退出菜单" );
                	   int x=Integer.parseInt(in.nextLine());//选择菜单
                	   
                	   
                	   
                	   
                	   
                	   out.println();
                	   
                	   
                	   
                	   switch(x){
                	   		case 1:{//获取当前时间
                	   			Date date=new Date();
                	   			DateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                	   			String time=format.format(date);
                	   			out.println("当前时间："+time);
                	   			out.println();
                	   			break;
                	   		}
                	   		case 2:{//获取IP
                	   			out.println("IP:"+this.incoming.getInetAddress().toString());
                	   			out.println();
                	   			break;
                	   		}
                	   		case 3:{//文件搜索
                	   			out.println("文件搜索（选作）");
                	   			out.println();
                	   			break;
                	   		}
                	   		case 4:{//退出菜单
                	   			xline=false;
                	   			out.println("退出成功");
                	   			out.println();
                	   			out.println( "输入menu，选择菜单" );
                	            out.println( "输入quit，退出服务器" );
                	            out.flush();
                	   			break;
                	   		}
                	   }
            	   }
            	   
               }
             
               
            }
         }
         finally
         {
            incoming.close();
         }
      }
      catch (IOException e)
      {  
         e.printStackTrace();
      }
   }

}