class Person{
String name ;
int age ;
String country = "
南京
" ;
public Person(String name,int age){
this.name = name ;
this.age = age ;
}
public void print(){
System.out.println("
姓名:
"+this.name+"
,年龄:
"+age+"
,城市:
"+country) ;
}
};
public class Demo02{
public static void main(String args[]){
Person p1 = new Person("
张三
",30) ;
Person p2 = new Person("
李四
",31) ;
Person p3 = new Person("
王五
",32) ;
p1.print() ;
p2.print() ;
p3.print() ;
}
};
|
class Person{
String name ;
int age ;
static String country = "
南京
" ;
public Person(String name,int age){
this.name = name ;
this.age = age ;
}
public void print(){
System.out.println("
姓名:
"+this.name+"
,年龄:
"+age+"
,城市:
"+country) ;
}
};
public class Demo02{
public static void main(String args[]){
Person p1 = new Person("
张三
",30) ;
Person p2 = new Person("
李四
",31) ;
Person p3 = new Person("
王五
",32) ;
System.out.println("------------
修改之前
--------------") ;
p1.print() ;
p2.print() ;
p3.print() ;
p1.country = "
北京
" ;
System.out.println("------------
修改之后
--------------") ;
p1.print() ;
p2.print() ;
p3.print() ;
}
};
|
Person.country = "
北京
" ;
|
public static void setCountry(String country){
this.country = country ;
}
|
class Person{
private String name ;
private int age ;
private static String country = "
南京
" ;
//
加入一个修改
country
属性的操作
public static void setCountry(String c){
country = c ;
}
public Person(String name,int age){
this.name = name ;
this.age = age ;
}
public void print(){
System.out.println("
姓名:
"+this.name+"
,年龄:
"+age+"
,城市:
"+country) ;
}
};
public class Demo03{
public static void main(String args[]){
Person p1 = new Person("
张三
",30) ;
Person p2 = new Person("
李四
",31) ;
Person p3 = new Person("
王五
",32) ;
System.out.println("------------
修改之前
--------------") ;
p1.print() ;
p2.print() ;
p3.print() ;
Person.setCountry("
北京
") ;
System.out.println("------------
修改之后
--------------") ;
p1.print() ;
p2.print() ;
p3.print() ;
}
};
|
class Person{
private String name ;
private int age ;
private static int count = 0 ;
//
所以在此处就可以为其赋上一个系统内定的名字
public Person(){
this.name = "person-"+count++ ;
}
public Person(String name,int age){
count++ ;
this.name = name ;
this.age = age ;
}
public void print(){
System.out.println("
姓名:
"+this.name+"
,年龄:
"+age) ;
}
};
public class Demo05{
public static void main(String args[]){
Person p1 = new Person() ;
Person p2 = new Person() ;
Person p3 = new Person() ;
p1.print() ;
p2.print() ;
p3.print() ;
}
};
|
public class Demo06{
public static void main(String args[]){
for(int i=0;i<args.length;i++){
System.out.println(args[i]) ;
}
}
};
|