?? greaterthan.java
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public class GreaterThan extends Expression { private Expression firstOp, secondOp; public GreaterThan(Expression f, Expression s) { firstOp = (Expression)f.clone(); secondOp = (Expression)s.clone(); } public int eval() { return ((firstOp.eval()>secondOp.eval())?1:0); } public Object clone() { return new GreaterThan(firstOp, secondOp); } public String toString() { return firstOp.toString()+secondOp.toString()+labelling()+"GT\n"; }}?? 快捷鍵說明
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