?? plus.java
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package gep.num;import gep.Expression;import java.util.ArrayList;import java.util.List;/** * 加法表達式 */public class Plus implements NExpression{ public static final char code = '+'; public static final int arity = 2; private NExpression left; private NExpression right; public char getCode() { return code; } public int getArity() { return arity; } public void addChild(Expression child) { if (left==null) { left = (NExpression) child; return; } if (right==null) { right = (NExpression) child; return; } throw new IllegalStateException("ADD_CHILD_ERROR"); } public double evaluate() { return left.evaluate() + right.evaluate(); } public String toString() { return "(" + left + ")+(" + right + ")"; } public List getChildren() { List children = new ArrayList(); children.add(left); children.add(right); return children; }}
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