teststringbuilder.java

疯狂Java讲义_源码(含Java设计模式CHM

/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class TestStringBuilder
{
	public static void main(String[] args) 
	{
		StringBuilder sb = new StringBuilder();
		//追加字符串
		sb.append("java");//sb = "java"
		//插入
		sb.insert(0 , "hello "); //sb="hello java"
		//替换
		sb.replace(5, 6, ","); //sb="hello java"
		//删除
		sb.delete(5, 6);//sb="hellojava" 
		System.out.println(sb);
		//反转
		sb.reverse();//sb="avajolleh"
		System.out.println(sb);
		System.out.println(sb.length()); //输出9 
		System.out.println(sb.capacity());  //输出16
		//改变StringBuilder的长度，将只保留前面部分
		sb.setLength(5); //sb="avajo"
		System.out.println(sb);
	}
}