Java将项目从INT数组添加到字符串数组

Question

public static String fibonacci(int a, int b){

        int max = 10;
        String returnValue;

        int[] result = new int[max];
        result[0] = a;
        result[1] = b;
                for (int i1 = 2; i1 < max; i1++) {
                    result[i1] = result[i1 - 1] + result[i1 - 2];
                }
                for (int i3 = 0; i3 < max; i3++) {
                    //Here you can do something with all the values in the array one by one
                    //Maybe make something like this?:
                    int TheINTthatHasToBeAdded = result[i3];
                    //The line where TheINTthatHasToBeAdded gets added to the String returnValue

                }           


        return returnValue;

    }

-

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结果数组的项是整数，返回值是字符串

我的问题是,；如何将结果数组中的项添加到returnValue数组中

Answer 1

我想你是想返回一个字符串，其中包含你找到的所有fibonaci数字？ 如果是，请更改以下内容：

StringBuilder returnValue = new new StringBuilder()

将以下内容添加到第二个循环中

returnValue.append(result[i3]).append(",");

将返回值更改为：

return returnValue.toString();

这应该可以解决这个问题（最后加上一个“，”

Answer 2

要将数组转换为String，可以使用^{}：

returnValue = java.util.Arrays.toString(result);

尽管如此，返回计算数组的String表示仍然不是一个好的设计。最好返回int[]，让客户端将其转换为String或以其他方式使用它或向用户显示它

以下是该方法的外观：

//changed the return type from String to int[]
public static int[] fibonacci(int a, int b) {
    int max = 10;
    int[] result = new int[max];
    result[0] = a;
    result[1] = b;
    for (int i1 = 2; i1 < max; i1++) {
        result[i1] = result[i1 - 1] + result[i1 - 2];
    }
    return result;
}

//in client method, like main
public static void main(String[] args) {
    //store the result of fibonacci method in a variable
    int[] fibonacciResult = fibonacci(0, 1);
    //print the contents of the variable using Arrays#toString
    System.out.println("Fibonacci result:" + Arrays.toString(fibonacciResult));
}

或者甚至使用另一种方式来消耗结果。下面是另一个例子：

public static void main(String[] args) {
    //store the result of fibonacci method in a variable
    int[] fibonacciResult = fibonacci(0, 1);
    //print the contents of the variable using Arrays#toString
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < fibonacciResult.length; i++) {
        sb.append(fibonacciResult[i])
            .append(' ');
    }
    System.out.println("Fibonacci result:" + sb.toString());
}