Question

这是作业：

编写一个名为printStrings的方法，它接受一个String和一个作为参数的重复次数和打印给定的字符串每次后有空格的次数。
printStrings("abc", 5);
将打印以下输出：
abc abc abc abc abc

这就是我的尝试：

public class Apples {

    public static String printStrings(String a) {

    return (int i = 1; i <= 5; i++) {
        System.out.print(a);
    }
    public static void main(String[] args) {
    System.out.println(printStrings("abc"));
    }
    }
}

真的不知道该怎么做。

Answer 1

稍微修改您的代码

public static void main(String[] args) {
    System.out.println(printStrings("abc", 5));
}

public static String printStrings(String a, int numOfTimes) {
    StringBuilder sb = new StringBuilder(""); // StringBuilder is better than concatenating Strings
    for (int i = 1; i <= numOfTimes; i++) {
        // System.out.println(sb);
        sb.append(a);  // append String 
        sb.append(" "); // append space
    }
    sb.replace(sb.length()-1, sb.length(), ""); // replace last space 
    System.out.println(sb.length()); 
    return sb.toString(); // return String representation of StringBuilder sb
}

O / P：

19
abc abc abc abc abc

Answer 2

public void printStrings(String a, int b) {
    String printString = "";
    for (int i = 0; i<b; i++){
       printString = printString+" "+a;
    }

    System.out.println(printString);
}

Answer 3

这样可行，但最后不会留出空格：

private static void printStrings(String str, int num) {
    for (int i = 0; i < num; i++) {
        System.out.print(str + (i == num - 1 ? "" : " "));
    }
}

Answer 4

public static String printStrings(String a, int count) {
    String result = "";
    for (int i = 0 ; i < count ; i++)
    {
        result = result + a;
        if (i != (count-1))
            result = result + " ";
    }
    return result;
}
public static void main(String[] args) {
    System.out.println(printStrings("abc", 5));
}

Answer 5

    public static String printStrings(String a,int b) {
    String s = "";
    for(int i = 1; i <= b; i++) {
        s=s+a+" ";    

    }
    return s;
   }

public static void main(String[] args) {
System.out.println(printStrings("abc",5));
}

（Java）尝试使用return语句打印“abc”5次

5 个答案: