Question

我比较新,不提点人通过,使我困惑不解。我写了家庭工作功能,要求我恢复用户投入的长度,并将使用投入分配给一个阵列,因为这种方法消失了用户投入阵列,这是错误的。

public static int readArray(char[] intoArray)
    {
        char[] capture = captureInputAsCharArray(); //User input comes back as char[]
        System.arraycopy(intoArray,0, capture, 0, capture.length);

        return capture.length;
    }

public static main(String[] args)
{
        size = readArray(arrItem7);  // item 7
        System.out.println(size);
        printOneInLine(arrItem7);  // prints individual elements of array
}

Answer 1

由于你有以下论点:<编码>System.arraycopy(后退。

rel=“noretinger”http://download.oracle.com/javase/6/docs/api/java/lang/System.html

public static void arraycopy(Object src,
                             int srcPos,
                             Object dest,
                             int destPos,
                             int length)

Swap intoArray和capture:

System.arraycopy(capture,0, intoArray, 0, capture.length);

Answer 2

为了做你想要做的工作(针对用户的投入和重新确定其规模),你可以这样做:

import java.util.*;


class Main{
  public static void main(String argv[])
  {
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter something");
    String line = sc.nextLine();
    char [] my_array = line.toCharArray();
    System.out.println("You entered an input of length "+line.length());
  }

}

And it will give this:

$ java Main 
Enter something
Hello
You entered an input of length 5

Answer 3

参考本身具有价值。在此情况下,您应回填(capture)。本身不是长度。

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