java--String和StringBuffer转换

1.1 通过构造方法

package cn.test;

public class main{
    public static void main(String[] args){
        String s = "abc";
        
        StringBuffer sb = new StringBuffer(s);
        
        System.out.print("输出的值是：" + sb);
    }
}

1.2 通过append()方法

package cn.test;

public class main{
    public static void main(String[] args){
        String s = "abc";
        
        StringBuffer sb = new StringBuffer();
        sb.append(s);
        
        System.out.print("输出的值是：" + sb);
    }
}

二、StringBuffer转String

2.1 构造方法

package cn.test;

public class main{
    public static void main(String[] args){
       
        StringBuffer sb = new StringBuffer("abc");
        
        String s = new String(sb);

        System.out.print("输出的值是：" + s);
    }
}

2.2通过toString()方法

package cn.test;

public class main{
    public static void main(String[] args){
       
        StringBuffer sb = new StringBuffer("abc");
        
        String s = sb.toString();

        System.out.print("输出的值是：" + s);
    }
}