Skip to main content
 首页 » 编程设计

Java StringBuilder基本用法

2022年07月19日26JustinYoung
//StringBuilder用法 
public class StringBuilderTest { 
    public static void main(String[] args) { 
        StringBuilder sb = new StringBuilder(); 
        //追加字符串 
        sb.append("Java"); 
        //sb = "Java"; 
        System.out.println(sb); 
        //插入 
        sb.insert(0, "Hello "); 
        //sb = "Hello Java"; 
        System.out.println(sb); 
        //替换 
        sb.replace(5, 6, ","); 
        //sb = "Hello,Java"; 
        System.out.println(sb); 
        //删除 
        sb.delete(5, 6); 
        //sb = "HelloJava"; 
        System.out.println(sb); 
        //反转 
        sb.reverse(); 
        System.out.println(sb); 
        //输出9 
        System.out.println(sb.length()); 
        //输出16 
        System.out.println(sb.capacity()); 
        //改变StringBuilder的长度,只保留前面部分 
        sb.setLength(5); 
        //sb = "avaJo"; 
        System.out.println(sb); 
    } 
}

 


本文参考链接:https://www.cnblogs.com/wgl1995/p/9365552.html