package com.text_3;//静态方法不能直接调用实例方法和变量,,但可以间接调用(即在静态方法中创建类的实例,然后调用)class Demo_12 {public static void main(String[] args) {Circle c=new Circle();Demo_12 d=new Demo_12();method1();//此处报错,静态方法不能直接调用非静态方法d.method1(); //间接调用,无错c.setRadius(5.0); //间接调用,无错}public void method1(){method2();}public static void method2(){Circle c=new Circle();System.out.println("what is radius " +c.getRadius());}}class Circle{private double radius;public double getRadius() {return radius;}public void setRadius(double radius) {this.radius = radius;}}
因害怕失败而不敢放手一搏,永远不会成功