assign.java

myassembler（大学作业）

public class Assign extends Statement {
   private String name;
   private Expression expr;

   public Assign(String var, Expression e) {
      name = new String(var);
      expr = (Expression)e.clone();
   }

   public void run() throws ExecutionException {
      if (!state.containsKey(name)) throw new NotDeclaredVariableException(name);
      state.put(name, new Integer(expr.eval()));
   }

   public Object clone() {
      return new Assign(name, expr);
   }

   public String toString() {
      return expr.toString()+labelling()+"STORE "+ name + "\n";
   }
}