if语句的运用

单向if语句：

//判断从键盘输入的数的奇偶
import java.util.Scanner;


public class Study1 {
public static void main(String[]args){
Scanner input =new Scanner (System.in);
System.out.print("Enter the number1 is ");
int number1=input.nextInt();
if (number1 % 2==0){
System.out.print("The number1 " +number1 + " is 偶数");}
if (number1 % 2==1){
System.out.print("The number1 " +number1 + " is 奇数");}
}}

双向if语句：

//判断从键盘输入的数的奇偶
import java.util.Scanner;


public class Study1 {
public static void main(String[]args){
final double IP=3.14159;
Scanner input =new Scanner (System.in);
System.out.print("Enter the number1 is ");
double number1=input.nextDouble();
double number2 =number1%2;
if (number2==0){
System.out.print("The number1 " +number1 + " is 偶数");}
else {
System.out.print("The number1 " +number1 + " is 奇数");}
}}