在第二种情况下的印刷电路板和第三种印刷电路板上印刷新的矩阵？

Question

关于印刷电路板复制为什么要打印新版？虽然是电路板的副本，甚至在印刷电路板上代替电路板复制它的印刷新板，其中电路板的数据是否被新板更换？

import java.util.Scanner;


public class MagicTrick {

    public static void main(String[] args) {

        int board[][]=new int[4][4];
        int boardcopy[][]=new int[4][4];
        boardcopy=board;
        int k=1;
    for(int i=0;i<4;i++){//initializing first board
        for(int j=0;j<4;j++){
            board[i][j]=k;
            k++;
        }
    }

    Scanner sc=new Scanner(System.in);
    System.out.println("Input");
    int testcse=sc.nextInt();

    /*for(int i=0;i<4;i++){//printing first board
        for(int j=0;j<4;j++){
            System.out.print(boardcopy[i][j]+" ");
        }
    System.out.println();   
    }*/
    int case1=sc.nextInt();//taking first case
    case1--;



    for(int i=0;i<4;i++){//printing first board
        for(int j=0;j<4;j++){
            System.out.print(board[i][j]+" ");
            }
        System.out.println();
        }
    int case1extend=sc.nextInt();                   //asking for second case


    int newboard[][];
    newboard=board;
    /*System.out.println("tanu");
    for(int i=0;i<4;i++){//printing first board
        for(int j=0;j<4;j++){
            System.out.print(board[i][j]+" ");
        }
        System.out.println();
        }*/

    int buffer;

        for(int z=0;z<4;z++){                       //making newboard
            /*buffer=board[j][j];

                                                    newboard[j][j]=newboard[case1][j];
                                                    newboard[case1][j]=buffer;*/
            if(z==2){
            buffer=newboard[2][2];
            newboard[2][2]=newboard[1][1];
            newboard[1][1]=buffer;
            }
            else{
            buffer=newboard[z][2];
            newboard[z][2]=newboard[case1][z];
            newboard[case1][z]=buffer;
            }

        }

        for(int i=0;i<4;i++){                       //printing firstextended board
            for(int j=0;j<4;j++){
                System.out.print(newboard[i][j]+" ");
                }
            System.out.println();
        }






        int case2=sc.nextInt();
        case2--;
        for(int i=0;i<4;i++){//printing second board
            for(int j=0;j<4;j++){
                System.out.print(boardcopy[i][j]+" ");
                }
            System.out.println();
            }
        int case2extend=sc.nextInt();

        for(int i=0;i<4;i++){//printing first board
            for(int j=0;j<4;j++){
                System.out.print(boardcopy[i][j]+" ");
                }
            System.out.println();
            }




        int case3=sc.nextInt();

        for(int i=0;i<4;i++){//printing first board
            for(int j=0;j<4;j++){
                System.out.print(boardcopy[i][j]+" ");
                }
            System.out.println();
            }

        int case3extend=sc.nextInt();

        for(int i=0;i<4;i++){//printing first board
            for(int j=0;j<4;j++){
                System.out.print(boardcopy[i][j]+" ");
                }
            System.out.println();
            }
        System.out.println("Output");

        System.out.println("Case #1:"+boardcopy[case1][case2]);
        System.out.println("Case #2:"+"Bad magician!");
        System.out.println("Case #3:"+"Volunteer cheated!");
    }

}