Question

在我的searchForANumber方法中，我试图显示是否在我的数组中找到了数字。问题是，我使用和if, else确定searchValue是否匹配for循环中数组语句中的值，当我这样做时，数组中的最后一个变量是测试，我的返回值仅基于最终值。我怎样才能使我的返回短语基于数组中的所有元素，而不仅仅是最后一个元素？我是否使用了一段时间，一段时间，切换循环？任何帮助表示赞赏。

    import java.util.Scanner;

public class Practice {
public static void main(String[] args){
    Scanner input = new Scanner(System.in);

    System.out.println("Enter your minimum number: ");
    int minNumber = input.nextInt();

    System.out.println("Enter your maximum number: ");
    int maxNumber = input.nextInt();

    int[] array = new int[(maxNumber-minNumber)+1];
    int[]readInArray = new int[maxNumber-minNumber+1];

    readInArray=readNumbers(minNumber, maxNumber, array);

    printNumbers(readInArray, minNumber);

    searchForANumber(readInArray, minNumber);

    sumNumbers(readInArray);

    printBackward(readInArray);


}//end of main method

private static void printBackward(int[] readInArray) {
    for (int i=(readInArray.length-1);i>0;i--){
        System.out.print(readInArray[i] + " ");
    }

}

private static void sumNumbers(int[] readInArray) {
    int total = 0;
    for (int i=0;i<readInArray.length;i++){

        total = total + readInArray[i];
    }
    System.out.println(total);

}

private static void searchForANumber(int[] readInArray, int minNumber) {
    Scanner input = new Scanner(System.in);
    System.out.println("Enter number to search for: ");
    int searchValue = input.nextInt();
    boolean returnValue = false;
    for (int i = 0; i < readInArray.length;i++) {
        if (searchValue == readInArray[i])
            returnValue=true;
            break;

    }// end of for
    System.out.println(returnValue);

}

private static void printNumbers(int[] readInArray, int minNumber) {
    for (int i = 0; i < readInArray.length;i++) {
        System.out.print(readInArray[i] + " ");
        minNumber++;
    }
    System.out.println(" ");

}

private static int[] readNumbers(int minNumber, int maxNumber, int[] array) {
    for (int i = 0; i < array.length;i++) {// input grades for each students
        array[i]=minNumber;
        minNumber++;
    } // end of for loop

    return array;
} // end of readArray method

}//end of class

Answer 1

你可以用两种方式做到。

使您的方法searchForANumber返回布尔值。

private static boolean searchForANumber(int[] readInArray, int minNumber) {
//before for loop
for (int i = 0; i < readInArray.length;i++) {
    if (searchValue == readInArray[i])
        return true;
    }
return false;
}

使用break和boolean

private static void searchForANumber(int[] readInArray, int minNumber) {
//before for loop
boolean found = false;
for (int i = 0; i < readInArray.length;i++) {
    if (searchValue == readInArray[i]){
       found = true;
       break;
      }
    }
if(found)
 System.out.println("Found");
else
 System.out.println("Not Found");
}

逐步穿过阵列＆amp;基于搜索项返回数组中的匹配/非匹配值

1 个答案: