华恩JAVA班第11天

华恩JAVA班第11天

 

一、封装

class Student{
 private String name;
 private int age;
 private char gender;
 public void setGender(char gender){
  if(gender == '男'||gender =='女'){
   this.gender =gender;
  }else{
    System.out.println("输入错误");
  }
 }
 public char getGender(){
  return this.gender;
 }
}

public class Test
{
 public static void main(String[] args)
 {
  Student one = newStudent();
  one.setGender('男');
  System.out.println(one.getGender());
 }
}

二、构造方法

class Cat{
 private String name;
 private int age;
 Cat(){
 }
 Cat(String name,int age){
  this.name = name;
  this.age = age;
  //System.out.println("姓名"+this.name+"年龄"+this.age);
 }
 void get(){
  System.out.println(this.name);
 }
}
public class Test{
 public static void main(String[] args)
 {
  Cat one = new Cat();
  one.get();
  Cat two = newCat("小花",3);
  two.get();
 }
}

三、方法的重载

class Student{
 public void max(int a, int b){
  System.out.println(a>b?a:b);
 }
 public void max(double a , double b){
  System.out.println(a>b?a:b);
 }
 public void max(double a , double b , doublec){
  double max =(a>b?a:b);
  System.out.println(max>c?max:c);
 }
}
public class Test
{
 public static void main(String[] args)
 {
  Student one = newStudent();
  one.max(7,4);
  Student two = newStudent();
  two.max(1.3,5.7);
  Student three = newStudent();
  three.max(1.2,7.8,5.4);
 }
}