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This article brings you the basics of Java: encapsulation - method overloading - introduction to construction methods (with code), so that you can have a preliminary understanding of them, and I hope it will be useful to you. help.
1. Encapsulation
class Dog{ String name;//成员变量 int age; private char genter;//加private变为私有属性,要提供方法才能在外部进行调用 public void setGenter(char genter){ //加if语句可以防止乱输入 if(genter=='男'||genter=='女'){ this.genter=genter;//this.name,这个name为成员变量 }else{ System.out.println("请输入正确的性别"); } } public char getGenter(){ return this.genter; } } public class Test1{ public static void main(String[] args){ Dog one=new Dog(); one.setGenter('女'); System.out.println(one.getGenter()); } }
2. Overloading of methods
Method overloading means that a class can define multiple methods with the same name but different parameters. When called, the corresponding method will be selected based on different parameter lists.
class Cal{ 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,double c){ double max=a>b?a:b; System.out.println(max>c?max:c); } } public class Test1{ public static void main(String[] args){ Cal one=new Cal(); one.max(88.9,99.3,120); } }
3. Constructor (constructor)
class Dog{ private String name; private int age; Dog(String name,int age){//构造方法,public可加可不加 this.name=name; this.age=age; System.out.println("名字:"+this.name+"年龄:"+this.age); } Dog(){ } void get(){//普通方法,public可写可不写 System.out.println("我是一个普通方法"); }14 15 }16 public class Test1{ public static void main(String[] args){ Dog one=new Dog("小明",26); Dog two=new Dog(); one.get(); two.get(); } }
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