将阵列向右移动 - 作业

Question

这是我到目前为止,但是当我运行它时,我得到Java不匹配错误.这是我的阵列:

char[] letters = {'A', 'B' , 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J'};


/********************************************************************************
    shiftRight() will move the contents of the array one slot to the right
********************************************************************************/
public static void shiftRight( char [] letters )
{
    char last = letters[letters.length-1];          // save off first element

    // shift right
    for( int index =letters.length-1; index >= 0 ; index-- )
        letters[index+1] = letters [index];

    // wrap last element into first slot
    letters[0] = last;
    System.out.print("\nshifted Array: " );
}

Answer 1

你可以这样做:

 public static void shiftRight( char [] letters )
    {

        char last = letters[letters.length-1];          // save off first element

        // shift right
        for( int index =letters.length-2; index >= 0 ; index-- )
            letters[index+1] = letters [index];

        // wrap last element into first slot
        letters[0] = last;
        System.out.print("\nshifted Array: " + Arrays.toString(letters) );

    }

我只修改了你的:letters.length-1进入letters.length-2并打印了数组.

另一种更简单的方法是使用,System.arraycopy如:

last = letters[letters.length-1];
System.arraycopy(letters, 0, letters, 1, letters.length-1 );
letters[0] = last;

要打印阵列,您还可以使用:

System.out.print("{");
for (int i=0;i<letters.length-1;i++)
    System.out.print("'"+letters[i]+",");
System.out.println("'"+letters[letters.length-1]+"'}");