《Java就業培訓教程》P81源碼
class Compare
{
	 public static void main(String[] args)
	  {
			String str1 = new String("abc");
			String str2 = new String("abc");
			String str3 = str1;
			if(str1==str2)
				System.out.println("str1==str2");
			else
				System.out.println("str1!=str2");	
			if(str1==str3)
				System.out.println("str1==str3");
			else
				System.out.println("str1!=str3");	
	}
}

《Java就業培訓教程》P82源碼
class Compare
{
	 public static void main(String[] args)
	  {
			String str1 = new String("abc");
			String str2 = new String("abc");
			String str3 = str1;
			if(str1.equals(str2))
				System.out.println("str1 equal str2");
			else
				System.out.println("str1 not equal str2");	
			if(str1.equals(str3))
				System.out.println("str1 equal str3");
			else
				System.out.println("str1 not equal str3");	
	}
}

《Java就業培訓教程》P86源碼
class Person
{
	private int age;
	public void setAge(int i)
	{
		if(i<0 || i>130)
			return;
		age = i; 
	}
	public int getAge()
	{ 
		return age;
	}
}
public class TestPerson
{
	public static void main(String args[])
	{
		Person p1 = new Person();
		p1.setAge(3);
		p1.setAge(-6);
		System.out.println(p1.getAge());
	}
}

《Java就業培訓教程》P88源碼
class Person
{
    public Person()
    {
		System.out.println("the constructor 1 is calling!");
	}
	private int age = 10;
	public void shout()
	{
		System.out.println("age is "+age); 
	}
}
class TestPerson
{
	public static void main(String[] args)
	{
		Person p1=new Person();
		p1.shout();
		Person p2=new Person();
		p2.shout();
		Person p3=new Person();
		p3.shout();
	}
}

《Java就業培訓教程》P90源碼
class Person
{
	private String name="unknown";
	private int age = -1;
	public Person()
	{
		System.out.println("constructor1 is calling");
	}
    public Person(String n)
	{
        name = n;
        System.out.println("constructor2 is calling");
		System.out.println("name is "+name);
    }
	public Person(String n,int a)
	{
        name = n;
        age = a;
        System.out.println("constructor3 is calling");
		System.out.println("name and age is "+name+";"+age);
    }
        public void shout()
	    {
		    System.out.println("listen to me!!"); 
		}
}
class TestPerson
{
	public static void main(String[] args)
	{
		Person p1=new Person();
		P1.shout();
		Person p2=new Person("Jack");
		P2.shout();
		Person p3=new Person("Tom",18);
		P3.shout();
	}
}
《Java就業培訓教程》P94源碼
class Person
{
    private Person()
    {
		System.out.println("the constructor 1 is calling!");
	}
}
class TestPerson
{
	public static void main(String[] args)
	{
		Person p1=new Person();
	}
}
《Java就業培訓教程》P95源碼
class A
{
	String name;
	public A(String x)
	{	
		name = x;	
	} 
	public void func1()
	{
		System.out.println("func1 of " + name +" is calling");
	}
	public void func2()
	{
		A a2 = new A("a2");
		a2.func1();
	}
}
class TestA
{
	public static void main(String [] args)
	{
		A a1 = new A("a1");
		a1.func2();
	}
}
《Java就業培訓教程》P96源碼
class A
{
	String name;
	public A(String x)
	{
		name = x;
	} 
	public void func1()
	{
		System.out.println("func1 of " + name +" is calling");
	}
	public void func2()
	{
		A a2 = new A("a2");
		this.func1();//使用this關鍵字調用func1方法
		a2.func1();
	}
}
《Java就業培訓教程》P99源碼
class Container
{
	Component comp;
	public void addComponent()
	{
		comp = new Component(this);//將this作為對象引用傳遞
	}
}
class Component
{
	Container myContainer;
	public Component(Container c)
	{
		myContainer = c;
	}
}
《Java就業培訓教程》P100源碼
public class Person
{
	String name;
	int age;
	public Person(String name)
	{
		 this.name = name;
	}
	public Person(String name,int age)
	{
		this(name);
		this.age = age;
	} 
}
《Java就業培訓教程》P101源碼
class Person
{
	public void finalize()
	{
		System.out.println("the object is going!");
	}
	public static void main(String [] args)
	{
		new Person();
		new Person();
		new Person();
		System.out.println("the program is ending!");
	}
}
《Java就業培訓教程》P103源碼
class PassValue
{
	public static void main(String [] args)
	{
		int x = 5;
		change(x);
		System.out.println(x);
	}
	public static void change(int x)
	{
		x = 3;
	}
}
class  PassRef
{
	int x ;
	public static void main(String [] args)
	{
		PassRef obj = new PassRef();
		obj.x = 5;
		change(obj);
		System.out.println(obj.x);
	}
	public static void change(PassRef obj)
	{
		obj.x=3;
	}
}

《Java就業培訓教程》P108源碼
class Chinese
{
	static String country="中國";
	String name;
	int age;
	void singOurCountry()
	{
		System.out.println("啊！，親愛的" + country);
		//類中的成員方法也可以直接訪問靜態成員變量
	}
}
class TestChinese
{
	public Static void main(String [] args)
	{
		System.out.println("Chinese  country is " + Chinese.country);
		//上面的程序代碼直接使用了"類名.成員"的格式
		Chinese ch1 = new Chinese();
		System.out.println("Chines country is " + ch1.country);
		//上面的程序代碼直接使用了"對象名.成員"的格式
		ch1.singOurCountry();
	}
}
《Java就業培訓教程》P111源碼
class StaticCode
{
	static String country;
	static
	{
		country = "china";
		System.out.println("StaticCode is loading");
	}
}
class TestStaticCode
{
	static
	{
		System.out.println("TestStaticCode is loading");
	}
	public static void main(String [] args)
	{
		System.out.println("begin executing main method");
		new StaticCode();
		new StaticCode();
	}
}
《Java就業培訓教程》P115源碼
class Outer
{
	int outer_i = 100;
	void test()
	{
		Inner in = new Inner();
		in.display();
	}
	class Inner
	{
		void display()
		{
		System.out.println("display: outer_i = " + outer_i);
		}
	}
}
class InnerClassDemo
{
	public static void main(String[] args)
	{
		Outer outer = new Outer();
		outer.test();
	}
}