String构造函数 

 1 package cn.itcast.p1.string.demo;
 2 
 3 public class StringConstructorDemo {
 4     public static void main(String[] args) {
 5         stringConstructorDemo();
 6         stringConstructorDemo2();
 7     }
 8 
 9     private static void stringConstructorDemo2() {
10         char[] arr = {'w','a','p','q','x'};
11         String s = new String(arr,1,3);//String(char[] value,int offset,int count)
12         System.out.println("s="+s);
13         
14     }
15 
16     public static void stringConstructorDemo() {
17         
18         String s = new String();//等效于String s = "";不等效于String s = null;
19         
20         byte[] arr = {97,66,67,68};
21         
22         String s1 = new String(arr);
23         System.out.println("s1="+s1);
24     }
25     
26 }
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posted @ 2021-10-13 17:23  doremi429  阅读(18)  评论(0)    收藏  举报