JAVA中StringBuffer和String的相互转换

StringBuffer和String的相互转换

A：String – StringBuffer
    a：通过构造方法
    b：通过append()方法
B：StringBuffer – String
    a：通过构造方法
    b：通过toString()方法
    c：通过subString(0,length);

package com.heima.stringbuffer;
public class Demo06_StringBuffer {
    public static void main(String[] args) {
        //demo01();
        StringBuffer sb = new StringBuffer("heima");
        
        String s1 = new String(sb);                        //通过构造将StringBuffer转换为String
        System.out.println(s1);
        
        String s2 = sb.toString();                        //通过toString方法将StringBuffer转换为String
        System.out.println(s2);
        
        String s3 = sb.substring(0, sb.length());        //通过截取子字符串将StringBuffer转换为String
        System.out.println(s3);
    }

    private static void demo01() {
        StringBuffer sb1 = new StringBuffer("heima");    //通过构造方法将字符串转换为StringBuffer对象
        System.out.println(sb1);
        
        StringBuffer sb2 = new StringBuffer();
        sb2.append("heima");                            //通过append方法将字符串转换为StringBuffer对象
        System.out.println(sb2);
    }
}