何建誠,w3schools,陣列array,方法,迴圈for-each

w3schools學習:陣列array,方法,迴圈for-each

/* 何建誠2022.11.7.w3schools,陣列array,陣列長度方法length,陣列是在型態後面加[] corner bracket */
public class Main {
  public static void main(String[] args) {
    String[] hey = {"富豪", "寶馬", "福特", "馬自達", "勞斯萊斯","賓士"};
    System.out.println(hey.length);
    /*方法,函數, length陣列長度*/
    /*迴圈輸出陣列hey*/
    for (int i = 0; i < 5; i++){
    System.out.println(hey[i]);
    }
    for ( String i: hey) {/*使用for-each迴圈,將each屬於hey陣列的元素*/}
    System.out.println(i);
  }
}
/*() round bracket, <> angle角 bracket,[]corner bracket,{}curly bracket捲形, https://en.wikipedia.org/wiki/Bracket
*/

  }
}
/*() round bracket, <> angle角 bracket,[]corner bracket,{}curly bracket捲形, https://en.wikipedia.org/wiki/Bracket
*/

截圖

教學影片152

重要觀念,期末考

• Java資料型態分為兩大類:原型態primitive type與非原型態non-primitive type又稱參照型態reference type
• 原型態
  1. 位元數byte
  2. 短整數short
  3. 整數int(ingeter)
  4. 長整數long:佔8八位元組
  5. 浮點數fioat:實數
  6. 倍精數double
  7. 字元char
  8. 布林數boolean
• 非原型態
  1. 類別Class
  2. 物件Object
  3. 字串String:是字元characters的串接
  4. 陣列Array
  5. 介面Interface