made King class 'first functions'

src/pieces/King.java

 package pieces;
 
-public class King {
+import game.Square;
+
+import java.util.ArrayList;
+
+public class King extends Piece {
+    private int x,y;
+    public King(String ID,String imagePath,String color,int x,int y)
+    {
+        this.x=x;
+        this.y=y;
+        setPieceId(ID);
+        setImage( imagePath);
+        setPieceColor(color);
+    }
+    public void setx(int x)
+    {
+        this.x=x;
+    }
+    public void sety(int y)
+    {
+        this.y=y;
+    }
+    public int getx()
+    {
+        return x;
+    }
+    public int gety()
+    {
+        return y;
+    }
+    public ArrayList<Square> move(Square state[][], int x, int y){
+//The java.util.ArrayList.clear() method removes all of the elements from this list.The list will be empty after this call returns.
+        possibleSquares.clear();
+        int posx[]={x,x,x+1,x+1,x+1,x-1,x-1,x-1};
+        int posy[]={y-1,y+1,y-1,y,y+1,y-1,y,y+1};
+        for(int i=0;i<8;i++)
+            if((posx[i]>=0&&posx[i]<8&&posy[i]>=0&&posy[i]<8))
+                if((state[posx[i]][posy[i]].getPiece()==null|| !state[posx[i]][posy[i]].getPiece().getPieceColor().equals(this.getPieceColor())))
+                    possibleSquares.add(state[posx[i]][posy[i]]);
+        return possibleSquares;
+    }
+
+
 }