Java 字符串连接的性能问题分析

<span style="font-size:18px;">public static void main(String[] args) { 
     
    long start1 = System.currentTimeMillis(); 
    String result1 =""; 
    for(int i = 0 ; i < 50000;i++){ 
      result1 += String.valueOf(i); 
    } 
    long end1 = System.currentTimeMillis(); 
    System.out.println("String Connect Time:"+(end1-start1)+"ms"); 
     
    long start2 = System.currentTimeMillis(); 
    StringBuilder result2 = new StringBuilder(); 
    for(int i = 0 ; i < 50000;i++){ 
      result2.append(i); 
    } 
    long end2 = System.currentTimeMillis(); 
    System.out.println("StringBulider Connect Time:"+(end2-start2)+"ms"); 
  }</span>