w3school學習Java迴圈for-loop字串Srting

w3schools學習Java程式碼

/*郭怡吟w3shools, Java, 2022/10/14*/
public class Main {
  public static void main(String[] args) {
    int i;
    int j;        /*宣告整數integer i, j */
    int k = 10;   /*宣告整數integer k且給值= */
    String a="第";/*雙引號包字串String,單引號包字元*/
    String b="列";/*宣告字元character a, b且給值*/
    System.out.println("郭怡吟編寫Java, 2022/10/14");
    for (i = 1; i < k ; i++) {  /*迴圈for loop*/
      System.out.print(a + i + b + ": ");
      for ( j = 0; j < i; j++)
         System.out.print(j + " ");
      System.out.println(); /*換列line縮寫為ln*/
    }  
  }
}

教學影片146

ASCII美國標準資訊交換碼UNICODE統一碼Character.toString碼轉成字元

/*郭怡吟w3shools, Java, 2022/10/14*/
public class Main {
  public static void main(String[] args) {
    int i;
    System.out.println("郭怡吟編寫Java, 2022/10/14");
    for ( i = 48; i < 128; i++)
        System.out.println( i + " 字碼是字元 " +Character.toString(i) );
         /*方法(函數)字元Character的.toString將字碼轉換成字串*/
    for ( i = 40845; i < 40900; i++)
      System.out.println( i + " 字碼是字元 " + Character.toString(i) );
  System.out.println("萬國碼unicode為地球上所有文字編碼，包含傳統的ascii只有128個");
  }
}