《Java就业培训教程》 作者：张孝祥 书中源码
《Java就业培训教程》P127源码
程序清单：Student.java
class Person
{
public String name;
public int age;
public Person(String name,int age)
{
this.name=name;
this.age=age;
}
public Person() //如果不写这个构造函数，看看对类Student有什么影响。
{
}
public void getInfo()
{
System.out.println(name);
System.out.println(age);
}
}
class Student extends Person
{
public void study()
{
System.out.println("Studding");
}
public static void main(String[] args)
{
Person p=new Person();
p.name="person";
p.age=30;
p.getInfo();
Student s=new Student();
s.name="student";
s.age=16;
s.getInfo();
s.study();
}
}
《Java就业培训教程》P135源码
interface Animal extends Runner
{
void breathe();
}
class Fish implements Animal
{
public void run()
{
System.out.println("fish is swimming");
}
public void breathe()
{
System.out.println("fish is bubbling");
}
}
abstract LandAnimal implements Animal
{
public void breathe()
{
System.out.println("LandAnimal is breathing");
}
}
《Java就业培训教程》P138源码
程序清单：C.java
class A
{
public void func1()
{
System.out.println("A func1 is calling");
}
public void func2()
{
func1();
}
}
class B extends A
{
public void func1()
{
System.out.println("B func1 is calling");
}
public void func3()
{
System.out.println("B func3 is calling");
}
}
class C
{
public static void main(String [] args)
{
B b=new B();
A a = b;
callA(a);
callA(new B());
}
public static void callA(A a)
{
a.func1();
a.func2();
}
}
《Java就业培训教程》P141源码
程序清单：Student.java
class Student
{
String name;
int age;
boolean equals(Object obj)
{
Student st=null;
if(obj instanceof Student)
st = (Student)obj;
else
return false;
if(st.name==this.name && st.age==this.age)
return true;
else
return false;
}
public static void main(String[] args)
{
Student p=new Student();
Student q=new Student();
p.name="xyz";
p.age=13;
q.name="xyz";
q.age=13;
if(p.equals(q))
System.out.println("p 与 q 相等");
else
System.out.println("p 与 q 不等");
}
}
《Java就业培训教程》P144源码
程序清单：Interface.java
interface PCI
{
void start();
void stop();
}
class NetworkCard implements PCI
{
public void start()
{
System.out.println("Send ...");
}
public void stop()
{
System.out.println("Network Stop.");
}
}
class SoundCard implements PCI
{
public void start()
{
System.out.println("Du du...");
}
public void stop()
{
System.out.println("Sound Stop.");
}
}
class MainBoard
{
public void usePCICard(PCI p)
{
p.start();
p.stop();
}
}
class Assembler
{
public static void main(String [] args)
{
MainBoard mb=new MainBoard();
NetworkCard nc=new NetworkCard();
mb.usePCICard(nc);
SoundCard sc=new SoundCard();
mb.usePCICard(sc);
}
}
《Java就业培训教程》P149源码
public class TestException
{
public static void main(String [] args)
{
try
{
int reslut = new Test().devide( 3, 0 );
System.out.println("the result is" + reslut );
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
System.out.println("program is running here ,that is normal !");
}
}
class Test
{
public int devide(int x, int y)
{
int result = x/y;
return x/y;
}
}
《Java就业培训教程》P154源码
public class TestException
{
public static void main(String [] args)
{
try
{
int result = new Test().devide( 3, 0 );
//int result = new Test().devide( 3, -1 );
//int result = new Test().devide( 3, 1 );
System.out.println("the result is " + result );
}
catch(DevideByMinusException e)
{
System.out.println("program is running into"+
"DevideByMinusException");
System.out.println(e.getMessage());
System.out.println("the devisor is " +
e. getDevisor());
}
catch(ArithmeticException e)
{
System.out.println("program is running into"+
"DevideByMinusException");
System.out.println(e.getMessage());
}
catch(Exception e)
{
System.out.println("program is running into"+
"other unknowned Exception");
System.out.println(e.getMessage());
}
System.out.println("program is running here ,that is normal !");
}
}
《Java就业培训教程》P158源码
package org.it315;
public class TestPackage
{
public static void main(String [] args)
{
new Test().print();
}
}
class Test
{
public void print()
{
System.out.println("the program is demostrating how to using package!");
}
}
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