print different states from the original state only (in JAVA)

Question

everyone , i'm managing to create a 8-puzzle game in java,

i'm trying to find possible moves (of the blank board ,that contains "0") from the original state

How ever i can't undertand why java isn't taking the original state everytime

for example :

original state = [1,2,3,4,0,5,6,7,8] first move should be to get 0 "UP" so new_etat1 = [1,0,3,4,2,5,6,7,8]

second move should be to get 0 "DOWN" so new_eta2 = [1,2,3,4,7,5,6,0,8] but it is showing me this instead :

Here is my code:

Main.java:

public class Main{


public static void main(String[] args) {
    String [] etat_init = [1,2,3,4,0,5,6,7,8,];

    Successeur S = new Successeur(etat_init);

    S.successor(etat_init);
}

Successuer.java:

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

public class Successeur {
private String[] etat = new String [9];
private String[] new_etat1 = new String [9];
private String[] new_etat2 = new String [9];
private String[] new_etat3 = new String [9];
private String[] new_etat4 = new String [9];
private int case_vide_index;

public Successeur(String [] etat) {
            this.new_etat1 = etat;
            this.new_etat2 = etat;
            this.new_etat3 = etat;
            this.new_etat4 = etat;
            this.case_vide_index = 4;       
}
    
private void  Deplacer_case_vide(String[] X,int a, int b){
    String temp;
    temp = X[a];
    X[a] = X[b];
    X[b] = temp;
    //return X;
}   

public void successor(String [] etat) {

            int i ;
    //ON PEUT GLISSER LA CASE VIDE EN (HAUT)
    if(this.case_vide_index - 3 >= 0)
            {
                this.Deplacer_case_vide(this.new_etat1,(this.case_vide_index - 3), this.case_vide_index);
                for(i=0;i<9;i++){
                    System.out.println("*****************L'ETAT ***********************");
                    System.out.print("[");
                    for (i=0;i<9;i++)
                    {
                        System.out.print(" ["+this.new_etat1[i]+"] ");
                    }
                    System.out.println("]");            
                }
    }
    
    //ON PEUT GLISSER LA CASE VIDE EN (BAS)
    if(this.case_vide_index + 3 < 9)
            {
                this.Deplacer_case_vide(this.new_etat2 ,(this.case_vide_index + 3), this.case_vide_index);           
                for(i=0;i<9;i++){
                    System.out.println("*****************L'ETAT ***********************");
                    System.out.print("[");
                    for (i=0;i<9;i++)
                    {
                        System.out.print(" ["+this.new_etat2[i]+"] ");
                    }
                    System.out.println("]");            
                }                    
    }   
            
    //ON PEUT GLISSER LA CASE VIDE A (DROITE)
    if(((this.case_vide_index + 1) % 3 == 1) || ((this.case_vide_index + 1) % 3 == 2))
            {
                this.Deplacer_case_vide(this.new_etat3,(this.case_vide_index + 1), this.case_vide_index); 
                for(i=0;i<9;i++){
                    System.out.println("*****************L'ETAT ***********************");
                    System.out.print("[");
                    for (i=0;i<9;i++)
                    {
                        System.out.print(" ["+this.new_etat3[i]+"] ");
                    }
                    System.out.println("]");            
                }                  
    }   
            
            
            
    //ON PEUT GLISSER LA CASE VIDE A (GAUCHE)
    if(((this.case_vide_index - 1) % 3 == 0) || ((this.case_vide_index - 1) % 3 == 1))
            {
 
                this.Deplacer_case_vide(this.new_etat4,(this.case_vide_index - 1), this.case_vide_index);   
                for(i=0;i<9;i++){
                    System.out.println("*****************L'ETAT ***********************");
                    System.out.print("[");
                    for (i=0;i<9;i++)
                    {
                        System.out.print(" ["+this.new_etat4[i]+"] ");
                    }
                    System.out.println("]");            
                }                    
    }   
     
}    

}