java - Value cannot be resolved or is not a field -

the method public boolean mergeswith(tile moving) returns true if this , moving tiles have same value. when check if same doing following:

if(this.value == temp.value){     return true; } 

then shows me error on temp.value saying value cannot resolved or not field.

how can fix that?

class twontile:

package game2048;  // concrete implementation of tile. twontiles merge each other // if have same value.  public class twontile extends tile {      private int value;      // create tile given value of n; should power of 2     // though no error checking done     public twontile(int n){         value = n;     }      // returns true if tile merges given tile. "this"     // (calling tile) assumed stationary tile while moving     // presumed moving tile. twontiles merge     // other twontiles same internal value.     public boolean mergeswith(tile moving){         tile temp = moving;         if(this.value == temp.value){             return true;         }         else{             return false;         }     }      // produce new tile result of merging tile     // other. twontiles, new tile twontile     // , have sum of 2 merged tiles value.     // throw runtime exception useful error message if     // tile , other cannot merged.     public tile merge(tile moving){          return null;     }      // score tile. score twontiles face     // value.     public int getscore(){          return -1;     }      // return string representation of tile     public string tostring(){          return "";     } } 

class tile:

package game2048;  // abstract notion of game tile. public abstract class tile{   // returns true if tile merges given tile.    public abstract boolean mergeswith(tile other);    // produce new tile result of merging tile   // other. may throw exception if merging illegal   public abstract tile merge(tile other);    // score tile.   public abstract int getscore();    // return string representation of tile   public abstract string tostring();  } 

first: can this:

public boolean mergeswith(tile moving){     return this.value == temp.value; } 

to more elegant solution.

second: need add value variable tile class.

public abstract class tile{    // ...    // add value tile    protected int value;     // ... } 

you have extended tile , added new field. field not tile's field , tile doesn't contain (doesn't see) it.

based on comment below:

when declare value in tile, don't need declare in twontile again. can make tile objects, not using constructors.

tile t = new twontile(...); 

is valid tile object. way, can implement logic have tried use.

look @ static , dynamic binding in java on so, or google it.