Question

java高手帮帮忙

第二题、编程题（共40分），将试题编写完成后 。试题要求如下：

1、试编写一个父类，一个继承父类的子类，和一个测试类，类名自己定义。

2、父类能够体现属性与方法，以及方法的重载。

3、子类完成父类方法中的覆盖。

4、测试类完成所有自定义方法测试。

那位高手帮帮忙做下 加分没问题

Answer 1

父类:
public class Person {

private String name;

public Person() {

name = "";
}

public Person(String aName) {
name = aName;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public void say() {

System.out.println("I am a person! My name is: " + this.getName());
}

}

子类:
public class BlackPerson extends Person {

public BlackPerson() {
super();
}

public BlackPerson(String aName) {

super(aName);
}

public void say() {

System.out.println("I am a blackPerson !My name is :" + this.getName());
}

}

测试类:
public class TestPerson {

public static void main(String[] args) {
Person aPerson = new Person("Father");
BlackPerson ablackPerson = new BlackPerson("Son");
aPerson.say();
ablackPerson.say();

}

}

Answer 2

try
{
FileOutputStream
out
=
new
FileOutputStream("D://info.txt");//把内容保存到D盘下的info.txt文件中
DataOutputStream
dataOut
=
new
DataOutputStream(out);
dataOut.write(txtbox.getString());//获取文本框里的内容
dataOut.flush();
length
=
dataIn.read(concent);
dataOut.close();
out.close();
}
catch
(IOException
ex)
{
ex.printStackTrace();
}
把这段代码写到
确定按钮的点击事件里就
ok
了

Answer 3

class Father {
private int money;

float weight, height;

String head;

void speak(String s) {
System.out.println(s);
}
}

class Son extends Father {
String hand, foot;
}

public class Example4_15 {
public static void main(String args[]) {

Son boy;

boy = new Son();

boy.weight = 1.80f;

boy.height = 120f;

boy.head = "one head";

boy.hand = "two hands";

boy.foot = "two foots";

boy.speak("i am your son");

System.out.println(boy.hand + boy.foot + boy.head + boy.weight
+ boy.height);
}
}

Answer 4

无语 这么简单的东西还要Java高手帮忙！

Answer 5

这不是都已经回答过了么？你2同一班的？