试图将数组传递给我的类构造函数

Question

我无法将数组传递给我的排序类，因为我需要使用两种不同的算法对同一个数组进行排序。我收到错误

Multiple markers at this line
- Syntax error on token(s), misplaced 
 construct(s)
- Syntax error on token(s), misplaced 
 construct(s)
- The constructor Mergesort() is undefined
- Syntax error on token "originalArray", delete 
 this token

代码

class sorterProgram {

public static void main(String args[]) {
    //Declares instances of the sorting classes

    int[] originalArray = new int[500];
    for (int i = 0; i < 500; i++) {
        originalArray[i] = (int) Math.round(Math.random() * 100);
    }
    Quicksort q = new Quicksort(originalArray);
    Mergesort m = new Mergesort(originalArray);
    //declares keyboard to accept user input for type of sort
    Scanner keyboard = new Scanner(System.in);
    //choice set as one so the do-while and if statements will start
    int choice = 1;
    // loop that does sorting untill the user is done


    do {
        System.out.println("Enter the # to start the sort of a 500 Element Array: \n1: Quicksort then Mergesort \n2: Exit");
        //only works if the user chooses the correct numbers
        if (1 == choice || choice == 2) {
            choice = keyboard.nextInt();
        }
        switch (choice) {
        case 1:
            System.out.println("Before Quicksort");
            q.print();
            long timeQuicksort = System.nanoTime();
            q.quicksort();
            long completedInQuicksort = System.nanoTime() - timeQuicksort;
            System.out.println("--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
            System.out.println("After Quicksort ");
            q.print();
            System.out.println("--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
            System.out.println("Before Mergesort");
            m.print();
            long timeMergesort = System.nanoTime();
            m.sort();
            long completedInMergesort = System.nanoTime() - timeMergesort;
            System.out.println("--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
            System.out.println("After Mergesort ");
            m.print();

            System.out.println("--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
            System.out.println("Time took to complete Quicksort (nanoseconds): "+ completedInQuicksort);
            System.out.println("Time took to complete Mergesort (nanoseconds): "+ completedInMergesort);
            break;
        case 2:
            System.out.println("Thanks for using the Quicksort and Mergesort");

        }

    } while (choice != 2);

}
}

这是我的两个排序器构造函数

class Quicksort {
int array[];
int size;

public Quicksort(int[] n) {
    size = n.length;
    // create array for merge sorting with size n+1
    array = new int[n.length + 1];
    // assign value into the array
    for (int i = 0; i < n.length; i++) {
        n[i] = array[i];
    }

class Mergesort {

private int size;
private int[] array;
private int[] tempMergeArray;

public Mergesort(int[] n) {

    size = n.length;
    // create array for merge sorting with size n+1
    array = new int[n.length + 1];
    // assign value into the array
    for (int i = 0; i < n.length; i++) {
        n[i] = array[i];
    }

    // set the last value as a big value so the sorting ends properly
    array[n.length] = 99999;
}

编辑：我现在通过了，但他们只是通过零

Answer 1

将数组作为变量传递给函数和构造函数时，语法与传递普通变量相同。

正确：

int[] myArray = new int[12];
myObject.myFunction(myArray);

不正确：

int[] myArray = new int[12];
myObject.myFunction(int[] myArray[]);

您可能想查看this，它将帮助您在 java 中使用数组。

此外，您可能需要确保它们在同一个包中。基于您缺少package my.package;，您似乎在默认包中拥有这些类。这很糟糕，因为您无法从单独的包中导入它们。 org.myamazingapplication 中的类不能执行 import myclass（假设 myclass 在默认包中）。还有很多 api 如bukkit 需要使用包。

Answer 2

改变

Quicksort q = new Quicksort(int [] originalArray[]);
Mergesort m = new Mergesort(int[] originalArray[] );

到

Quicksort q = new Quicksort(originalArray);
Mergesort m = new Mergesort(originalArray);

在你的两个构造函数中，改变

for (int i = 0; i < n.length; i++) {
    n[i] = array[i];
}

到

for (int i = 0; i < n.length; i++) {
    array[i] = n[i];
}