java构造方法的不同

分为有参数和无参数，还有THIS的使用方法，可用于传递给类，也可用于调用其它构造方法。

public class Book {

    private String name;

    public Book(){

        this("this调用有参数的构造方法");

        System.out.println("无参数的构造方法。");

    }

    public Book(String name){

        System.out.println("有参数构造方法。");

        this.name = name;

        //System.out.println("传入类的形参name：" + name);

    }

    public String getName(){

        int id = 0;

        //setName("Java");

        return id + this.name;

    }

    public void setName(String name){

        this.name = name;

    }

    public Book getBook(){

        return this;

    }

}

import java.util.Arrays;

public class HelloJava {
public static void main(String[] args) {

        // TODO Auto-generated method stub
System.out.println();

        Book abook = new Book("First Pamram");

        abook.setName("This name is import.");

        String astring = abook.getName();

        System.out.println(astring);

        Book bbook = new Book();
}

}