boy.java

实例精华

package mypro;

public class Boy {

    String firstName;
    String lastName;
    int age;

    public Boy()
    {
        System.out.println("------------------------------------------------------");
        System.out.println("Boy()被调用");
        //age = 20;
        System.out.println("firstName= "+firstName+"\n"+"lastName= "+lastName+"\n"+
                "age= "+age);
       System.out.println("------------------------------------------------------");
    }

    public Boy(String fName)
    {
        this();//调用构造器Boy()
        System.out.println("Boy(String fName)被调用");
        firstName = fName;
        System.out.println("firstName= "+firstName+"\n"+"lastName= "+lastName+"\n"+
                "age= "+age);
        System.out.println("------------------------------------------------------");
    }

    public Boy(String fName,String lName)
    {
        this(fName);//调用构造器Boy(String fName)
        System.out.println("Boy(String fName,String lName)被调用");
        firstName = fName;
        lastName = lName;
        System.out.println("firstName= "+firstName+"\n"+"lastName= "+lastName+"\n"+
                "age= "+age);
        System.out.println("------------------------------------------------------");

    }

    public Boy(String fName,String lName,int _age)
    {
        this(fName,lName);//调用构造器Boy(String fName,String lName)
        System.out.println("Boy(String fName,String lName,int _age)被调用");
        firstName = fName;
        lastName = lName;
        age = _age;
        System.out.println("firstName= "+firstName+"\n"+"lastName= "+lastName+"\n"+
                "age= "+age);
        System.out.println("------------------------------------------------------");
    }


}