打印小星星

public class xing
{
public static void main (String []args)
{
for(int i=0;i<=5;i++)
{
for(int j=0;j<=i-1;j++)
{
System.out.print("*");
}
System.out.println();
}
}
}

喝酒

import java.util.Scanner;
public class Test
{
public static void main(String[]args )
{
Scanner sc= new Scanner(System.in);
String name ="";
int sex=0;
int age=0;
String ch="y";
do{
System.out.println("请输入学生姓名：");
name=sc.next();
System.out.println("请输入学生的性别（男1，女，0）");
sex=sc.nextInt();
System.out.println("请输入学生的年龄");
age=sc.nextInt();
switch(sex)
{
case 0:
if(age<22)
System.out.println("为了保护你的身体健康，不能喝酒，只能喝饮料");
else
System.out.println("温馨提示，虽然能喝酒，但一定不能多喝。。");
break;
case 1:
if(age>18)
System.out.println("温馨提示，不能过度饮酒，身体要紧。");
else
System.out.println("你还是未成年人，不能喝酒");
break;
default:
System.out.println("请输入合法的性别（只能是男，女，没有人妖）");
}
System.out.println("是否继续");
ch=sc.next();
}while("y".equals(ch)||"Y".equals(ch));
}
}

调用方法和调用构造函数

public class Person
{
private String name;
private String sex;
private int age;
public Person()
{
}
public Person(String name,String sex,int age)
{
this.name= name;
this.sex=sex;
this.age=age;
}
public void show()
{
System.out.println("姓名: "+name+" –>> 性别："+sex+"–>>年龄："+age);
}
public static void main(String []args)
{
Person person1 = new Person("李连结","男",40);
Person person2 = new Person("利智","女",26);
person1.show();
person2.show();
}
}[/java]
[java]
public class Student
{
private String name;
private int no;
private String class1;
private String sex;
private int age;
private String address;
public Student()
{
}
public Student(String name,int no,String class1,String sex,int age,String address)
{
this.name=name;
this.no=no;
this.sex=sex;
this.class1=class1;
this.age=age;
this.address= address;
}
void show()
{
System.out.println("姓名："+name);
}
public static void main(String []args)
{
Student student1 = new Student("钦红",1,"1班","男",20,"龙岩");
Student student2 = new Student("啊新",2,"2班","男",22,"厦门");
if(student1.age>student2.age)
student1.show();
else
student2.show();
}
}