stringbufferdemo.java

软通公司培训的课件和习题里面有答案。。。

package com.nine.java;

public class StringBufferDemo {

	private StringBuffer sb = new StringBuffer("Hello ");
	
	
	public void testAppend(String s){
		sb.append(s);
		System.out.println(sb.toString());
	}
	
	public void testInsert(String s){
		sb.insert(2, s);
		System.out.println(sb.toString());
	}
	
	public void testDeleteCharAt(int i){
		sb.deleteCharAt(i);
		System.out.println(sb.toString());
	}
	
	public void testIndexOf(String s){
		System.out.println(sb.indexOf(s));
	}
	
	public void testReverse(){
		System.out.println(sb.reverse().toString());
	}
	

	public static void main(String[] args) {
		StringBufferDemo sd = new StringBufferDemo();
		String s = " Java ";
		//sd.testAppend(s);
		//sd.testInsert(s);
		//sd.testDeleteCharAt(1);
		sd.testIndexOf("e");
		sd.testReverse();
		

	}

}