readvariable.java

来自「myassembler（大学作业）」· Java 代码 · 共 21 行

public class ReadVariable extends Expression {
   private String name;
   
   public ReadVariable(String n) {
      name = n;
   }
   
   public int eval() throws NotDeclaredVariableException {
     if (!state.containsKey(name)) throw new NotDeclaredVariableException(name);
     return ((Integer)state.get(name)).intValue();
   }
   
   public Object clone() {
      return new ReadVariable(name);
   }
   
   public String toString() {
      return labelling()+"LOAD "+ name + "\n";
   }
}