diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo02.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo02.java"
new file mode 100644
index 0000000000000000000000000000000000000000..2b2cd0220101ca02b39a5fb403c530bef15d9216
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo02.java"
@@ -0,0 +1,21 @@
+import java.util.Scanner;
+
+public class Demo02 {
+
+	public static void main(String[] args) {
+		Scanner scan = new Scanner(System.in);
+		System.out.println("请输入X的值：");
+		int x = scan.nextInt();
+		System.out.println("请输入Y的值：");
+		int y = scan.nextInt();
+		System.out.println("请输入Z的值：");
+		int z = scan.nextInt();
+		x=x*x*x;
+		y=y*y*y;
+		z=z*z*z;
+		int sum = x+z+y;
+		System.out.println("S的结果是："+sum);
+		
+	}
+
+}
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo03.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo03.java"
new file mode 100644
index 0000000000000000000000000000000000000000..fd93eaa205f3322a0978be1591137aff7b3e684c
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo03.java"
@@ -0,0 +1,22 @@
+
+public class Demo03 {
+
+	public static void main(String[] args) {
+		Scanner scanner =new Scanner(System.in);
+		System.out.println("请输入n的值");
+		int n=scanner.nextInt();
+		System.out.println("请再输入m的值");
+		int m=scanner.nextInt();
+		System.out.println("最终结果为："+num(n,m));
+		
+	}
+
+	public static int  num(int n, int m) {
+		int sum=1;
+		for (int i = 1; i <=n; i++) {
+			sum*=m;
+		}
+		return sum;
+	}
+
+}
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo04.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo04.java"
new file mode 100644
index 0000000000000000000000000000000000000000..799ca4a2132b09864a52014a370b273094442437
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\210\230\346\200\235\347\233\210/Demo04.java"
@@ -0,0 +1,31 @@
+import java.util.Random;
+import java.util.Scanner;
+
+public class Demo04 {
+//在主函数中产生20个0-10之间的随机数，将这20个随
+	//机数存入数组，并通过函数计算某个数在这些随机数中出
+	//现的次数（这“某个数”是在主函数中由用户输入的）
+	public static void main(String[] args) {
+     Scanner scan = new Scanner(System.in);
+     Random  random = new  Random();
+     int[] numArray = new int [20];
+     for (int i = 0; i < 20; i++) {
+		 numArray[i]=random.nextInt(10)+1;
+		 System.out.print("numArray["+i+"]="+numArray[i]+"\t");
+		
+	} System.out.println();
+	System.out.println("请输入0~10的一个数：");
+	int a = scan.nextInt();
+	int sum=0;
+	for (int i = 0; i < numArray.length; i++) {
+	if(a==numArray[i]) {
+		sum++;
+	}
+	
+	}
+	System.out.println(a+"在数组中的次数为："+sum);
+	
+	}
+}
+
+