《Java就业培训教程》 作者：张孝祥 书中源码
《Java就业培训教程》P81源码
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就业培训教程》P82源码
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就业培训教程》P86源码
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就业培训教程》P88源码
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就业培训教程》P90源码
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就业培训教程》P94源码
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就业培训教程》P95源码
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就业培训教程》P96源码
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关键字调用func1方法
a2.func1();
}
}
《Java就业培训教程》P99源码
class Container
{
Component comp;
public void addComponent()
{
comp = new Component(this);//将this作为对象引用传递
}
}
class Component
{
Container myContainer;
public Component(Container c)
{
myContainer = c;
}
}
《Java就业培训教程》P100源码
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就业培训教程》P101源码
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就业培训教程》P103源码
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就业培训教程》P108源码
class Chinese
{
static String country="中国";
String name;
int age;
void singOurCountry()
{
System.out.println("啊！，亲爱的" + country);
//类中的成员方法也可以直接访问静态成员变量
}
}
class TestChinese
{
public Static void main(String [] args)
{
System.out.println("Chinese country is " + Chinese.country);
//上面的程序代码直接使用了"类名.成员"的格式
Chinese ch1 = new Chinese();
System.out.println("Chines country is " + ch1.country);
//上面的程序代码直接使用了"对象名.成员"的格式
ch1.singOurCountry();
}
}
《Java就业培训教程》P111源码
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就业培训教程》P115源码
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();
}
}
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