java字符连接成字符串 字符串的连接java

以下实例演示了通过 "+" 操作符和StringBuffer.append() 方法来连接字符串，并比较其性能：

StringConcatenate.java 文件

public  class  StringConcatenate {
     public  static  void  main(String[] args){
         long  startTime = System.currentTimeMillis();
         for ( int  i= 0 ;i< 5000 ;i++){
             String result =  "This is"
             +  "testing the"
             +  "difference" +  "between"
             +  "String" +  "and" +  "StringBuffer" ;
         }
         long  endTime = System.currentTimeMillis();
         System.out.println( "字符串连接" 
         +  " - 使用 + 操作符 : " 
         + (endTime - startTime)+  " ms" );
         long  startTime1 = System.currentTimeMillis();
         for ( int  i= 0 ;i< 5000 ;i++){
             StringBuffer result =  new  StringBuffer();
             result.append( "This is" );
             result.append( "testing the" );
             result.append( "difference" );
             result.append( "between" );
             result.append( "String" );
             result.append( "and" );
             result.append( "StringBuffer" );
         }
         long  endTime1 = System.currentTimeMillis();
         System.out.println( "字符串连接" 
         +  " - 使用 StringBuffer : "
         + (endTime1 - startTime1)+  " ms" );
     }
}

以上代码实例输出结果为：