Java Example - Connection String

//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");

   }}

字符串连接 - 使用 + 操作符 : 0 ms

字符串连接 - 使用 StringBuffer : 42 ms