摘要： class Person { private String name; private int age; public Person(String name, int age) { this.name = name; this.age = age; } public String toString... 阅读全文

摘要： 取时间差： public class SystemDemo01 { public static void main(String[] args) { long startTime = System.currentTimeMillis(); for (int i = 0; i < 1000; i++) { try... 阅读全文