JavaSE，

JavaSE，

面向对象

public class Person {
        static String name;
        int age;
        char sex;
        //静态代码块  伪静态变量赋值
        static {
            name = "李金克";
            System.out.println("调用了静态代码块");
        }
        //非静态代码块
        {
        
        }
        //无参构造方法
        public Person() {
            
        }
        //有参构造方法
        public Person(String name) {
            this.name = name;
        }
        //全参构造
    
        public void huXi() {
            System.out.println("呼吸");
        }
        
        public Person(int age, char sex) {
            super();
            this.age = age;
            this.sex = sex;
        }

        
        public Person(String name, int age, char sex) {
            super();
            //this.name = name;
            this.age = age;
            this.sex = sex;
        }
        public void eat() {
            System.out.println(name + "吃饭");    
        }
        public void sleep() {
            System.out.println("睡觉");
        }

public static void main(String[] args) {
    Person xw = new Person();
    Person.name = "xiaoming";
    xw.age = 5;
    //xw.name = "小五";
    xw.sex = 'M';
    xw.eat();
    xw.huXi();
    xw.sleep();
    }
}

public class Point {

        int x;
        int y;
        public Point (int x ,int y) {
            this.x = x;
            this.y = y;
        }
        public double distance (int a, int b) {
            return Math.sqrt(Math.pow(x - a, 2)+Math.pow(y - b, 2));
        }
        public double distance (Point p) {
            return Math.sqrt(Math.pow(x - p.x, 2)+Math.pow(y - p.y, 2));
        }
public static void main(String[]args) {
    Point p1 = new Point(1,1);
    Point p2 = new Point(4,5);
    System.out.println(p1.distance(p2));
    }
}

package com.sxt;

public class MathUtil {
    public static double add(double a, double b) {
        double sum = a + b;
        return sum;
    } 
    public static double subtract(double a ,double b) {
        double subtract = a - b;
        return subtract;
    }
    public static double multiply(double a ,double b) {
        double multiply = a - b;
        return multiply;
    }
    public static double divide(double a, double b) {
        double divide = a / b;
        return divide;
    }
    public static void main(String[] args) {
        double a = MathUtil.add(3.2,9.6);
        double b = MathUtil.subtract(6.4, 6.1);
        double c = MathUtil.multiply(23, 6);
        double d = MathUtil.divide(5, 2);
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);
        System.out.println(d);
    }
}

• 4 .

package com.sxt;

import java.math.BigInteger;

public class Teacher {
         String name;
         int age;
         String place;
         String telphone;
        public Teacher(String name, int age, String place, String telphone) {
            super();
            this.name = name;
            this.age = age;
            this.place = place;
            this.telphone = telphone;
        }
        public void teach() {
            System.out.println("教学内容");
        }
        
        public void test() {
            System.out.println("考试");
        }
        public void introduce() {
            System.out.println("自我介绍："+name+age+place+telphone);
        }
        public static void main(String[] args) {
            Teacher Lxs = new Teacher("李先念",30,"河南郑州","1234567890");
            Teacher Wxs = new Teacher("王阳明",45,"河南洛阳","9876543210");
            Lxs.introduce();
            Lxs.teach();
            Lxs.test();
            Wxs.introduce();
            Wxs.teach();
            Wxs.test();
        }
}