PGM->Java/条件判定 - プログラミングの勉強をしよう@Wiki

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条件判定

条件判断

if

if-else

import java.io.*;
 
class sample01{
    public static void main(String[] args){
 
        try{
             InputStreamReader isr = new InputStreamReader(System.in);
             BufferedReader br = new BufferedReader(isr);
 
             while(true){
                 String a = br.readLine();
                 int b = Integer.parseInt(a);
 
                 if(b == 10){
                     System.out.println("10が入力");
 
                 }else  if(b == 99){
                     break;
 
                 }else{
                     System.out.println("それ以外が入力");
                 }
             }
 
        }catch(Exception ex){
            ex.printStackTrace();
 
        }
 
    }
}
 

多分岐

switch

int、charなど

import java.io.*;
 
class sample02{
    public static void main(String[] args){
 
        try{
            InputStreamReader isr = new InputStreamReader(System.in);
            BufferedReader br = new BufferedReader(isr);
 
            while(true){
                String a = br.readLine();
                int b = Integer.parseInt(a);
                boolean c = false;
 
                switch(b){
                case 10:
                    System.out.println("10が入力");
                    break;
 
                case 20:
                    System.out.println("20が入力");
                    break;
 
                case 30:
                    System.out.println("30が入力");
                    break;
 
                case 99:
                    System.out.println("システム終了");
                    c = true;
                    break;
 
                default:
                    System.out.println(b + "が入力");
                    break;
                }
 
                if(c == true){
                    break;
                }
            }
 
        }catch(Exception ex){
            ex.printStackTrace();
 
        }
    }
}
 

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