# 題目
## a001

import java.util.Scanner;

public class a001 {
  public static void main(String []args){
    Scanner scanner = new Scanner(System.in);
    String tmp = scanner.nextLine();
    System.out.println("hello, " + tmp);
  }
}

### 筆記
1. `nextLine`下一航輸入的資料。
## a002

import java.util.Scanner;

public class a002{
  public static void main(String []args){
    Scanner scanner = new Scanner(System.in);
    String inputNum = scanner.nextLine();
    String stringArry[] = inputNum.split(" ");
    int totle = 0;
    int numArry[];

    numArry = new int [stringArry.length];
    for (int i = 0; i < stringArry.length; i++) {
      numArry[i] = Integer.parseInt(stringArry[i]);
    }
    for (int i = 0; i < numArry.length; i++){
      totle += numArry[i];
    }
    System.out.println(totle);
  }
}

### 筆記
1. `split(" ")`分割字串。
2. `nextInt`也可以使用
## a003

import java.util.Scanner;

public class a003{
  public static void main(String []args){
    Scanner scanner = new Scanner(System.in);
    int M = scanner.nextInt();
    int D = scanner.nextInt();
    int S = (M*2+D)%3;

    switch (S){
      case 0:
        System.out.println("普通");
        break;
      case 1:
        System.out.println("吉");
        break;
      case 2:
        System.out.println("大吉");
        break;
    }
  }
}

### 筆記
1. 結構

switch (要判斷的變數){
      case 0:
        break;
      case 1:
        break;
      case 2:
        break;
    }

## a004

import java.util.Scanner;

public class a004{
  public static void main(String []args){
    Scanner scanner = new Scanner(System.in);
    int inputYear;
    //多數人卡在這步驟hasNextInt()，被出現的"你執行了X行"，或者使用true發生錯誤，我就卡在這XD。
    while (scanner.hasNextInt()) {
      inputYear = scanner.nextInt();
      if((inputYear % 4 == 0 && inputYear % 100 != 0)||inputYear % 400 == 0){
        System.out.println("閏年");
      }else{
        System.out.println("平年");
      }
    }
  }
}

### 觀念
1. 題目條件直到 EOF 結束，為什麼一定要用`hasNextInt()`不能用`true`，因為題目提出關閉輸入時while會在重複一次，這樣審核系統會報錯，而`hasNextInt()`偵測到關閉就直接跳出迴圈。

您的程式被監控系統中斷，可能是程式無法正常結束所導致。 
Exception in thread "main" 
java.util.NoSuchElementException at 
java.base/java.util.Scanner.throwFor(Scanner.java:937) at 
java.base/java.util.Scanner.next(Scanner.java:1594) at 
java.base/java.util.Scanner.nextInt(Scanner.java:2258) at 
java.base/java.util.Scanner.nextInt(Scanner.java:2212) at 
a004.main(a004.java:8) Exception in thread "main" 
java.util.NoSuchElementException at 
java.base/java.util.Scanner.throwFor(Scanner.java:937) at 
java.base/java.util.Scanner.next(Scanner.java:1594) at 
java.base/java.util.Scanner.nextInt(Scanner.java:2258) at 
java.base/java.util.Scanner.nextInt(Scanner.java:2212) at 
a004.main(a004.java:8)

### 筆記
1. `scanner.hasNextInt()`判斷下一行是否為數字。