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w3schools編寫Java程式語言 微軟VS Code編寫Java程式語言 Java程式語言 public class Main {/*謝宇哲w3schools內建方法length,charAt*/ public static void main(String[] args) { String a = "狗吃大便,貓抓鼠"; String b = ""; /*字串b初始值是空的*/ int c = a.length(); /*方法 length() 得到字串長度*/ System.out.println("原來字串: " + a); System.out.println("字串長度: " + c); for (int i = 0; i

public class Main { /*謝宇哲recursion地回函數*/ public static void main(String[] args) { int x = 11; /*Java程式必須以Main起始*/ for (int i=0; i 0) {return k + sum(k - 1);} else { return 0;} } /*函數sum呼叫自己,稱遞迴*/ public static int f(int k) { if (k > 0) {return k * f(k - 1);} else { return 1;} } /*0!=1, 7! 7*6!,...*/ }