cos,sin

public class HelloWorld {

public static void main(String[] args) {

int x,y,z;
double pi;

x=1;
y=1;
z=x+y;
pi=Math.PI;
System.out.println("x="+x);
System.out.println("x="+y);
System.out.println("x="+z);
System.out.println("cos(0)="+Math.cos(0));
System.out.println("cos(pi/4)="+Math.cos(pi/4));
System.out.println("cos(pi/2)="+Math.cos(pi/2));
System.out.println("cos(3pi/2)="+Math.cos(3*pi/2));
System.out.println("cos(2pi)="+Math.cos(2*pi));
System.out.println("sin(0))="+Math.sin(0));
System.out.println("sin(pi/4))="+Math.sin(pi/4));
System.out.println("sin(pi/2))="+Math.sin(pi/2));
System.out.println("sin(3*pi/2))="+Math.sin(3*pi/2));
System.out.println("sin(2*pi))="+Math.sin(2*pi));
}

}

聖誕樹

class first
{
public static void main(String[] args)
{

System.out.println(" *");
System.out.println(" *** ");
System.out.println(" ***** ");
System.out.println(" ******* ");
System.out.println(" ********* ");
System.out.println(" *** ");
System.out.println(" *** ");

}

}