子类继承父类问题
class Person
{
private String name;
private int age;
public Person(String name,int age)
{
this.name=name;
this.age=age;
}
public void print()
{
System.out.println( "Name: "+name+ "\nage: "+age);
}
}
class Student extends Person
{
int stuid;
}
public class test1
{
public static void main(String args[])
{
Person a=new Person( "mark ",20);
a.print();
Student b=new Student( "susan ",22);
b.print();
}
}
怎样输出子类里的stuid?
[解决办法]
class Student extends Person
{
int stuid;
public void print()
{
System.out.println( "Name: "+name+ "\nage: "+age+ "\nstuid: "+stuid);
}
}
[解决办法]
class Person{
private String name;
private int age;
public Person(String name,int age){
this.name=name;
this.age=age;
}
public void print(){
System.out.println( "Name: "+name+ "\nage: "+age);
}
public String toString(){
return get.Class().get.Name()+
"[姓名： "+name+ " "+ "年龄： "＋age+ "] ";
}
}
class Student extends Person{
private int stuid;
public Student(String name, int age, int stuid){
super(name,age);
this.stuid = stuid;
}
public void setStuid(int stuid){
this.stuid = stuid;
}
public int getStuid(){
return stuid;
}
public String toString(){
return super.toString()+
"[stuid= "+stuid+ "] ";
}
}
public class Test1{
public static void main(String[] args){
Person a = new Student( "谁谁． ",26,4589);
System.out.println(a.getStuid);
System.out.println(a);
}
}
[解决办法]
新建java学习群31317654，欢迎初学者和高手们加入
[解决办法]
class Person{
private String name;
private int age;
public Person(String name,int age){
this.name=name;
this.age=age;
}
public void print(){
System.out.println( "Name: "+name+ "\nage: "+age);
}
public String toString(){
return ( "姓名: "+name+ " "+ "年龄 "+age);
}
}
class Student extends Person{
private int stuid;
public Student(String name, int age, int stuid){
super(name,age);
this.stuid = stuid;
}
public void setStuid(int stuid){
this.stuid = stuid;
}
public int getStuid(){
return stuid;
}
public String toString(){
return super.toString()+( "stuid= "+stuid);
}
}
public class Test1{
public static void main(String[] args){
Person a = new Student( "谁谁 ",26,4589);
Student t=(Student) a;
System.out.println(t.getStuid());
System.out.println(t);
}
}
