插入代码几次,显示格式老是太乱。
package cn.com.bugyun.tmp;
public class Test {
String s = "";
long n = 1000000000;
private void function1() {
long startTime = System.currentTimeMillis();
for (long i = 0; i < n; i++) {
if (s == null || s.equals(""));
}
long endTime = System.currentTimeMillis();
System.out.println("function 1 use time: " + (endTime - startTime)
+ "ms");
}
private void function2() {
long startTime = System.currentTimeMillis();
for (long i = 0; i < n; i++) {
if (s == null || s.length() <= 0);
}
long endTime = System.currentTimeMillis();
System.out.println("function 2 use time: " + (endTime - startTime)
+ "ms");
}
private void function3() {
long startTime = System.currentTimeMillis();
for (long i = 0; i < n; i++) {
if (s == null || s.isEmpty());
}
long endTime = System.currentTimeMillis();
System.out.println("function 3 use time: " + (endTime - startTime)
+ "ms");
}
private void function4() {
long startTime = System.currentTimeMillis();
for (long i = 0; i < n; i++) {
if (s == null || s == "");
}
long endTime = System.currentTimeMillis();
System.out.println("function 4 use time: " + (endTime - startTime)
+ "ms");
}
public static void main(String[] args) {
Test test = new Test();
test.function1();
test.function2();
test.function3();
test.function4();
}
}
显示结果如下: