package text.java;

import junit.framework.TestCase;

public class StringBufferDemoTest extends TestCase {
    StringBuffer a= new StringBuffer("StringBuffer");
    StringBuffer b= new StringBuffer("20192309");
    StringBuffer c= new StringBuffer("dkyjinyifeidkyjinyifei");
    public void testchar() throws Exception {
        assertEquals('S',a.charAt(0));
        assertEquals('i',a.charAt(3));
        assertEquals('u',a.charAt(7));
    }
    public void testcampacity() throws Exception {
        assertEquals(28,a.capacity());
        assertEquals(24,b.capacity());
        assertEquals(38,c.capacity());
    }
    public void testlength() throws Exception {
        assertEquals(12,a.length());
        assertEquals(8,b.length());
        assertEquals(22,c.length());
    }
    public void testindexof() throws Exception {
        assertEquals(0,a.indexOf("Str"));
        assertEquals(6,b.indexOf("09"));
        assertEquals(3,c.indexOf("jin"));
    }
}