用Java利用集合类实现随机产生26个英文字母软键盘。

好的，下面是Java代码实现：

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class RandomKeyboard {
    public static void main(String[] args) {
        List<Character> letters = new ArrayList<>();
        for (char c = 'a'; c <= 'z'; c++) {
            letters.add(c);
        }
        Collections.shuffle(letters);
        char[][] keyboard = new char[3][9];
        keyboard[0][0] = letters.get(0);
        keyboard[0][1] = letters.get(1);
        keyboard[0][2] = letters.get(2);
        keyboard[0][3] = letters.get(3);
        keyboard[0][4] = letters.get(4);
        keyboard[0][5] = letters.get(5);
        keyboard[0][6] = letters.get(6);
        keyboard[0][7] = letters.get(7);
        keyboard[0][8] = letters.get(8);
        keyboard[1][0] = ' ';
        keyboard[1][1] = letters.get(9);
        keyboard[1][2] = letters.get(10);
        keyboard[1][3] = letters.get(11);
        keyboard[1][4] = letters.get(12);
        keyboard[1][5] = letters.get(13);
        keyboard[1][6] = letters.get(14);
        keyboard[1][7] = letters.get(15);
        keyboard[1][8] = ' ';
        keyboard[2][0] = ' ';
        keyboard[2][1] = letters.get(16);
        keyboard[2][2] = letters.get(17);
        keyboard[2][3] = letters.get(18);
        keyboard[2][4] = letters.get(19);
        keyboard[2][5] = letters.get(20);
        keyboard[2][6] = letters.get(21);
        keyboard[2][7] = letters.get(22);
        keyboard[2][8] = ' ';
        System.out.println("Random Keyboard:");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 9; j++) {
                System.out.print(keyboard[i][j] + " ");
            }
            System.out.println();
        }
    }
}

代码中，我们首先使用 `ArrayList` 存储所有的英文字母，然后使用 `Collections.shuffle()` 方法随机打乱字母的顺序。接着，我们按照软键盘的布局将字母填充到一个二维数组中，并输出软键盘。注意，空格也被视为一个键位。