Java示例连接字符串

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("Time taken for string"

         + "concatenation using + operator : "

         + (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("Time taken for String concatenation"

         + "using StringBuffer : "

         + (endTime1 - startTime1)+ " ms");

   }

}