day08--static-静态代码块的使用
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40
day08/src/com/inmind/static02/Demo11.java
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40
day08/src/com/inmind/static02/Demo11.java
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package com.inmind.static02;
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/*
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静态代码块:
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定义在成员位置,使用static修饰的代码块{ }。
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位置:类中方法外。
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执行:随着类的加载而执行且执行一次,优先于main方法和构造方法的执行。
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格式:
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static{
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java语句;
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}
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静态代码块的作用:在程序运行之前,就进行一些操作,常用于对静态变量的初始化操作,后期工作中常用于对配置文件的值赋值操作
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*/
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public class Demo11 {
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static int num = 10;
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String str;
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static{
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System.out.println("静态代码块执行了");
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if (1 > 0) {
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num = 200;
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} else {
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num = 300;
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}
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num = 100;
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}
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public static void main(String[] args) {
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System.out.println(num);
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System.out.println("程序开始");
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//创建1个学生
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Student student = new Student();
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System.out.println("程序结束");
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}
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public void test(){
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System.out.println("呵呵哒");
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}
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}
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@@ -21,6 +21,7 @@ public class Student {
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public Student() {
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System.out.println("学生类的无参构造方法调用了");
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}
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public Student(int id, int age, String name) {
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this.id = id;
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