worked on step

src/backend/Cell.java

@@ -15,10 +15,10 @@ public class Cell {
 	public int getDensity() {
 		return density;
 	}
-	public int setValue(int value) {
+	public void setValue(int value) {
 		this.value = value;
 	}
-	public int setDensity(int density){
+	public void setDensity(int density){
 		this.density = density;
 	}
 }

src/backend/Simulator.java

@@ -116,11 +116,22 @@ public class Simulator extends Thread {
 		Table tempTable = new Table(this.height, this.width);
 		for(int x=0; x<width; x++) {
 			for(int y=0; y<height; y++) {
-				if (table.countNear(x,y)<2) {
-					tempTable.getCell(x,y).setValue(0);
+				if (this.table.getCell(x, y).getValue()=1) {
+					if (table.countNear(x,y)<2) {
+						tempTable.getCell(x,y).setValue(0);
+					} else if(table.countNear(x,y)>3) {
+						tempTable.getCell(x,y).setValue(0);
+					}
+				} else {
+					if(table.countNear(x,y)==3) {
+						tempTable.getCell(x,y).setValue(1);
+					}
 				}
+				
+
 			}
 		}
+		this.table = tempTable;
 
 		/* you should distribute this action in methods/classes
 		 * don't write everything here !