static

package mypro01;
/**
 * student类
 * @author 4090039qrh
 *
 */

public class Student {
    
    //非static属性
    String name;
    int age;
    
    //static属性
    
    static double weight;
    static double height;
    
    
    
    //static方法只能调用static变量
    
    public static void cal_weight() {
        // System.out.println(name);  不能调用非static属性 name
        System.out.println(weight);
    }
    
    //非static方法可以调用所有变量
    
    public void cal_height() {
        
        System.out.println(name);
        System.out.println(height);
        
    }
    
    public static void main(String[] args) {
        //static属性和方法不需要创建对象，直接调用
        

        Student.weight=100;
        Student.height=50;
        Student.cal_weight();
        
        //非static属性和方法需要创建对象，才可以调用
        
        Student s =new Student();
        s.name="qiao";
        s.age=18;
        s.cal_height();
        
    }