程式如下：import java.util.Scanner;public class CopyDemo{ public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("請輸入一個字串，並按回車執行："); String s1 = scanner.next(); System.out.println("s1=" + s1); String s2 = copy(s1); System.out.println("s2=" + s2); } public static String copy(String s) { if(s == null || s.trim().isEmpty()) return null; char[] a = s.toCharArray(); //任意字元陣列 char[] b = new char[a.length]; for(int i=0;i<a.length;i++) { b[i] = a[i]; } return new String(b); }} 有問題歡迎提問，滿意請採納，謝謝！
void copy(char *a,char *b){ char *p,*q; p=a;q=b; while(q!="\0") p++=q++;}
程式如下：import java.util.Scanner;public class CopyDemo{ public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("請輸入一個字串，並按回車執行："); String s1 = scanner.next(); System.out.println("s1=" + s1); String s2 = copy(s1); System.out.println("s2=" + s2); } public static String copy(String s) { if(s == null || s.trim().isEmpty()) return null; char[] a = s.toCharArray(); //任意字元陣列 char[] b = new char[a.length]; for(int i=0;i<a.length;i++) { b[i] = a[i]; } return new String(b); }} 有問題歡迎提問，滿意請採納，謝謝！