從if語句和for循環返回字符串

Question

我有以下代碼，而不是使用System.out.println（）方法，而是需要返回一個包含星號和負號的字符串，其方式與下面的代碼相同。

本質上，我需要在實際的返回字符串本身中包含星號和減號，而不僅僅是在末尾返回“”！

我對Java非常陌生，不知道如何執行此操作。

我將不勝感激任何建議。

public static String starMinusLine(int stars, int minuses){

            if(minuses ==1){
            for (int j= 0; j< stars; ++j){
                System.out.print("*");
            }
            for (int i = 0; i < (minuses); ++i){
                System.out.print("-");
            }
        }

            if (minuses % 2 == 0){
            for (int i = 0; i < (minuses*0.5); ++i){
                System.out.print("-");
            }
            for (int j= 0; j< stars; ++j){
                System.out.print("*");
            }
            for (int k=0; k < (minuses*0.5); ++k){
                System.out.print("-");
            }
        }
            if (minuses % 2 == 1 && minuses != 1){
            for (int i = 0; i < ((minuses*0.5)-0.5); ++i){
                System.out.print("-");
            }
            for (int j= 0; j< stars; ++j){
                System.out.print("*");
            }
            for (int k=0; k < ((minuses*0.5)); ++k){
                System.out.print("-");
            }   
        }
        return "";  
    }

Answer 1

只需使用StringBuilder即可構建字符串：

    public static String starMinusLine(int stars, int minuses) {
        StringBuilder sb = new StringBuilder();

        if (minuses == 1) {
            for (int j = 0; j < stars; ++j) {
                sb.append("*");
            }
            for (int i = 0; i < (minuses); ++i) {
                sb.append("-");
            }
        }

        if (minuses % 2 == 0) {
            for (int i = 0; i < (minuses * 0.5); ++i) {
                sb.append("-");
            }
            for (int j = 0; j < stars; ++j) {
                sb.append("*");
            }
            for (int k = 0; k < (minuses * 0.5); ++k) {
                sb.append("-");
            }
        }
        if (minuses % 2 == 1 && minuses != 1) {
            for (int i = 0; i < ((minuses * 0.5) - 0.5); ++i) {
                sb.append("-");
            }
            for (int j = 0; j < stars; ++j) {
                sb.append("*");
            }
            for (int k = 0; k < ((minuses * 0.5)); ++k) {
                sb.append("-");
            }
        }
        return sb.toString();
    }
}