オブジェクト配列からのキャスト戻しができません。可変長引数：１つの配列：オブジェクトキャスト

###前提・実現したいこと
”無理をして”、可変長引数に１つの配列を渡そうとしていますが、オブジェクト配列からのキャスト戻しができません。

###発生している問題・エラーメッセージ

Main.java:44: error: incompatible types: Object[] cannot be converted to int[] 
if(obj instanceof int[]){ 
^ 
Main.java:45: error: incompatible types: Object[] cannot be converted to int[] 
int[] d = (int[]) obj; 
^ 
2 errors

###該当のソースコード

import java.util.*;

public class Main{
	private static final Scanner scan = new Scanner(System.in);
	static boolean flag = false;

	public static void main(String[] args){
		
		int n = scan.nextInt();
		int[] d = new int[6];
		Dice[] dices = new Dice[n];

		
		for(int i = 0; i < n ; i++){
			for(int j = 0; j < 6; j++){
				d[j] = scan.nextInt();
			}
			Object objs = (Object) d;
			dices[i] = new Dice((Object) objs);
		}

		boolean ans = true;
		for(int i = 0; ans && i < n; i++){
			for(int j = i + 1; j < n; j++){
				if(dices[i].equals(dices[j])){
					ans = false;
					break;
				}
			}
		}
		System.out.println(ans? "Yes" : "No");
	}
}

class Dice{

	int[] _d = new int[6];
	public static final int
		TOP = 0, SOUTH = 1, EAST = 2,
		WEST = 3, NORTH = 4, BOTTOM = 5; // 定数

	public Dice(Object... obj){ // コンストラクタ
		for(int i = 0; i < 6; i++){
			if(obj instanceof int[]){
				int[] d = (int[]) obj;
				_d[i] = d[i];
			}
		}
	}

	public int[] showAll(){
		return _d;
	}

	@Override
	public boolean equals(Object obj){
		boolean result = false;
		Dice dice = (Dice) obj;
		for(int i = 0; i < 4; i++){
			for(int j = 0; j < 4; j++){
				if(Arrays.equals(showAll(), dice.showAll())){
					result = true;
					break;
				}
				dice.rollEast();
			}
			for(int j = 0; j < 4; j++){
				if(Arrays.equals(showAll(), dice.showAll())){
					result = true;
					break;
				}
				dice.rollNorth();
			}
			if(Arrays.equals(showAll(), dice.showAll())){
				result = true;
				break;
			}
			dice.rollRight();
		}
		return result;
	}

	public void rollSouth(){
		int tmp = _d[TOP];
		_d[TOP] = _d[NORTH];
		_d[NORTH] = _d[BOTTOM];
		_d[BOTTOM] = _d[SOUTH];
		_d[SOUTH] = tmp;
	}

	public void rollNorth(){
		int tmp = _d[TOP];
		_d[TOP] = _d[SOUTH];
		_d[SOUTH] = _d[BOTTOM];
		_d[BOTTOM] = _d[NORTH];
		_d[NORTH] = tmp;
	}

	public void rollEast(){
		int tmp = _d[TOP];
		_d[TOP] = _d[WEST];
		_d[WEST] = _d[BOTTOM];
		_d[BOTTOM] = _d[EAST];
		_d[EAST] = tmp;
	}

	public void rollWest(){
		int tmp = _d[TOP];
		_d[TOP] = _d[EAST];
		_d[EAST] = _d[BOTTOM];
		_d[BOTTOM] = _d[WEST];
		_d[WEST] = tmp;
	}

	public void rollRight(){
		int tmp = _d[SOUTH];
		_d[SOUTH] = _d[WEST];
		_d[WEST] = _d[NORTH];
		_d[NORTH] = _d[EAST];
		_d[EAST] = tmp;
	}
}

###試したこと
課題に対してアプローチしたことを記載してください

###補足情報(言語/FW/ツール等のバージョンなど)
より詳細な情報

行動規範の内容に同意します

回答1件

ベストアンサー

以下のコードで動きます

java
1import java.util.*;
2
3public class Main{
4    private static final Scanner scan = new Scanner(System.in);
5    static boolean flag = false;
6
7    public static void main(String[] args){
8
9        int n = scan.nextInt();
10        int[] d = new int[6];
11        Dice[] dices = new Dice[n];
12
13
14        for(int i = 0; i < n ; i++){
15            for(int j = 0; j < 6; j++){
16                d[j] = scan.nextInt();
17            }
18            Object objs = d;
19            dices[i] = new Dice((Object) objs);
20        }
21
22        boolean ans = true;
23        for(int i = 0; ans && i < n; i++){
24            for(int j = i + 1; j < n; j++){
25                if(dices[i].equals(dices[j])){
26                    ans = false;
27                    break;
28                }
29            }
30        }
31        System.out.println(ans? "Yes" : "No");
32    }
33}
34
35class Dice{
36
37    int[] _d = new int[6];
38    public static final int
39        TOP = 0, SOUTH = 1, EAST = 2,
40        WEST = 3, NORTH = 4, BOTTOM = 5; // 定数
41
42    public Dice(Object  ...obj){ // コンストラクタ
43        for(int i = 0; i < 6; i++){
44            if(obj[0] instanceof int[]){
45                int[] d = (int[]) obj[0];
46                _d[i] = d[i];
47            }
48        }
49    }
50
51    public int[] showAll(){
52        return _d;
53    }
54
55    @Override
56    public boolean equals(Object obj){
57        boolean result = false;
58        Dice dice = (Dice) obj;
59        for(int i = 0; i < 4; i++){
60            for(int j = 0; j < 4; j++){
61                if(Arrays.equals(showAll(), dice.showAll())){
62                    result = true;
63                    break;
64                }
65                dice.rollEast();
66            }
67            for(int j = 0; j < 4; j++){
68                if(Arrays.equals(showAll(), dice.showAll())){
69                    result = true;
70                    break;
71                }
72                dice.rollNorth();
73            }
74            if(Arrays.equals(showAll(), dice.showAll())){
75                result = true;
76                break;
77            }
78            dice.rollRight();
79        }
80        return result;
81    }
82
83    public void rollSouth(){
84        int tmp = _d[TOP];
85        _d[TOP] = _d[NORTH];
86        _d[NORTH] = _d[BOTTOM];
87        _d[BOTTOM] = _d[SOUTH];
88        _d[SOUTH] = tmp;
89    }
90
91    public void rollNorth(){
92        int tmp = _d[TOP];
93        _d[TOP] = _d[SOUTH];
94        _d[SOUTH] = _d[BOTTOM];
95        _d[BOTTOM] = _d[NORTH];
96        _d[NORTH] = tmp;
97    }
98
99    public void rollEast(){
100        int tmp = _d[TOP];
101        _d[TOP] = _d[WEST];
102        _d[WEST] = _d[BOTTOM];
103        _d[BOTTOM] = _d[EAST];
104        _d[EAST] = tmp;
105    }
106
107    public void rollWest(){
108        int tmp = _d[TOP];
109        _d[TOP] = _d[EAST];
110        _d[EAST] = _d[BOTTOM];
111        _d[BOTTOM] = _d[WEST];
112        _d[WEST] = tmp;
113    }
114
115    public void rollRight(){
116        int tmp = _d[SOUTH];
117        _d[SOUTH] = _d[WEST];
118        _d[WEST] = _d[NORTH];
119        _d[NORTH] = _d[EAST];
120        _d[EAST] = tmp;
121    }
122}