sdut java lab6主观题

8-1 SDUT-JAVA-TestPassArray

分数 1

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作者 马新娟

单位 山东理工大学

This is an array, which name is a.Arayy a has 2 elements,a[0] is 1 and a[1] is 2.

Now please write two methods,one only passes by value and the other pass array.In these two methods,the elements of a are swapped.

You should write the JAVA program to display all the values before invoking the methods and after invoking the methods.

public static void main(String\[\] args) {

    int\[\] a = {1, 2};

    System.out.println("调用方法之前：");

    displayArray(a);

    swapValue(a\[0\], a\[1\]);

    System.out.println("调用仅传递值的方法之后：");

    displayArray(a);

    swapArray(a);

    System.out.println("调用传递数组的方法之后：");

    displayArray(a);

}

public static void swapValue(int x, int y) {

    int temp = x;

    x = y;

    y = temp;

}

public static void swapArray(int\[\] arr) {

    int temp = arr\[0\];

    arr\[0\] = arr\[1\];

    arr\[1\] = temp;

}

public static void displayArray(int\[\] arr) {

    for (int i = 0; i < arr.length; i++) {

        System.out.print(arr\[i\] + " ");

    }

    System.out.println();

}

}