【详情点击链接:?p=56 | 测试之路-My Test Space】
public class TestCharacter {final static int time = 50000; //循环次数
public TestCharacter(){
}public void test(String s){long begin = System.currentTimeMillis();for(int i=0; i<time; i++){s += “add”;}long over = System.currentTimeMillis();System.out.println(“操作”+s.getClass().getName()+”类型使用的时间为：”+(over-begin)+”毫秒”);}public void test(StringBuffer s){long begin = System.currentTimeMillis();for(int i=0; i<time; i++){s.append(“add”);}long over = System.currentTimeMillis();System.out.println(“操作”+s.getClass().getCanonicalName()+”类型使用的时间为：”+(over-begin)+”毫秒”);}public void test(StringBuilder s){long begin = System.currentTimeMillis();for(int i=0; i<time; i++){s.append(“add”);}long over = System.currentTimeMillis();System.out.println(“操作”+s.getClass().getName()+”类型使用的时间为：”+(over-begin)+”毫秒”);}
/*对 String 直接进行字符串拼接的测试*/public void test2(){String s2 = “abcd”;long begin = System.currentTimeMillis();for(int i=0; i<time; i++){String s = s2 + s2 +s2;}long over = System.currentTimeMillis();System.out.println(“操作字符串对象引用相加类型使用的时间为：”+(over-begin)+”毫秒”);}public void test3(){long begin = System.currentTimeMillis();for(int i=0; i<time; i++){String s =”abcd” + “abcd” + “abcd”;}long over = System.currentTimeMillis();System.out.println(“操作字符串相加使用的时间为：”+(over-begin)+”毫秒”);}public static void main(String[] args){String s1 = “abcd”;StringBuffer st1 = new StringBuffer(“abcd”);StringBuilder st2 = new StringBuilder(“abcd”);TestCharacter tc = new TestCharacter();tc.test(s1);tc.test(st1);tc.test(st2);tc.test2();tc.test3();}}，香港空间，香港服务器，虚拟主机让你的心情地落到极点，一直学习生活等各个方面都做不好，最终害的还是自己。
