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]) ;
}
}
}; |