java--this关键字

this关键字

this可以用于：属性，方法，构造器

this用于属性和方法时，this可以理解为：当前对象

this用于属性和方法

使用this.属性 this.方法

this用于构造器

this(参数列表）调用构造器
只能放在首行

/**
 * this关键字
 */
public class Boy {
    
    
    
    private String name;
    private int age;
    
    public Boy(){
    
    
        
    }
    public Boy(String name,int age){
    
    
        this.name=name;
        this.age=age;
    }
    
    public Boy(String name){
    
    
        this(name,5);
        this.name=name;
    }
    
    public void setName(String name){
    
    
        this.name=name;
    }
    public void setAge(int age){
    
    
        this.age=age;
    }
    
    public void eat(){
    
    
        System.out.println("吃饭");
    }
    public void walk(){
    
    
        this.eat();
    }
    
}

public class Customer {
    
    

    private String firstName;
    private String lastName;
    private Account account;

    public Customer(String firstName,String lastName){
    
    
        this.firstName=firstName;
        this.lastName=lastName;
    }
    public void setAccount(Account account){
    
    
        this.account=account;
    }
    public String getFirstName(){
    
    
        return this.firstName;
    }
    public String getLastName(){
    
    
        return this.lastName;
    }
    public Account getAccount(){
    
    
        return this.account;
    }

    public static void main(String[] args) {
    
    
        Customer customer=new Customer("Jane","Smith");
        Account account=new Account(1000,2000,0.0123);
        customer.setAccount(account);
        customer.getAccount().deposit(100);
        customer.getAccount().withdraw(960);
        customer.getAccount().withdraw(2000);
    }
}