几种常见的string 构造方法

/*
 * 主要介绍几种string类的构造方法
 * 1、string()
 * 2.string(byte[] bytes),传的是byte类型的数组
 * 3.string(byte[] bytes,int index,int length)
 * 4.string(char[] value),传的是char类型的数组
 * 5.string(char[] value,int index,int length)
 * 6.string(string str) ，传的是字符串作为参数
 */

package cn.string;

public class StringDemo {
    public static void main(String[] args) {
        
        // TODO Auto-generated method stub
        //第一种方法 ，string(),没有意义
        String s1 = new String ();
        System.out.println("s1.String():"+s1);
        System.out.println("s1.String():"+s1.length());
        
        
        //第二种方法，string(byte[] bytes)
        byte [] byts = {97,98,99,100,101};
        String s2 = new String(byts);
        System.out.println("s2.String():"+s2);
        System.out.println("s2.String():"+s2.length());
        
        //第三种方法，string(byte[] bytes,int index,int length)
        String s3 = new String(byts,2,3);
        System.out.println("s3.String():"+s3);
        System.out.println("s3.String():"+s3.length());
        
        //第四种方法 string(char[] value)
        char [] by = {'a','b','c','d','e','f'};
        String s4 = new String(by);
        System.out.println("s4.String():"+s4);
        System.out.println("s4.String():"+s4.length());
        
        //第五种方法 string(char[] value,int index,int length)
        
        String s5 = new String(by,3,3);
        System.out.println("s4.String():"+s5);
        System.out.println("s4.String():"+s5.length());
        
        //第六种方法，string(string str)
        
        String str = "abcdef";
        String s6 = new String (str);
        System.out.println("s6.String():"+s6);
        System.out.println("s6.String():"+s6.length());
        
        
    }

}