simple java(十一)---application(6)

Write a program to let users input a year and then the program will give a “true” if that input is a leap year, otherwise the output will be “false”.
solution:
公元年數被4除盡的是閏年，但如被100除得盡而被400除不盡的則不是閏年。

import java.util.Scanner;

public class LeapYear {

public static void main(String[] args) {

boolean leap_year;

int year;

Scanner sc = new Scanner (System.in);

System.out.print("Please input a year:");

year = sc.nextInt();

leap_year = ((year % 4 == 0) && (year % 100 != 0)) (year % 400 == 0);

System.out.println(leap_year);}}

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Write an application that reads three nonzero integers and determines and prints ifthey could represent the sides of a right–angled triangle

solution:用公式a*a+b*b=c*c

import javax.swing.JOptionPane;

public class Triangle {

public static void main( String args[] ){

int side1, side2,hypotenuse;

String input,result;

input = JOptionPane.showInputDialog("Enter length of side 1:" );

side1 = Integer.parseInt( input );

input = JOptionPane.showInputDialog("Enter length of side 2:" );

side2 = Integer.parseInt( input );

input = JOptionPane.showInputDialog("Enter length of hypotenuse:" );

hypotenuse = Integer.parseInt( input );

if ( ( side1 * side1 + side2 * side2 ) ==( hypotenuse * hypotenuse ) )

result = "These are the sides of a right-angled triangle.";

else

result = "These do not form a right-angled triangle.";

JOptionPane.showMessageDialog( null, result, "Result",JOptionPane.INFORMATION_MESSAGE );

System.exit( 0 );} }