?? and.java
字號:
package com.javapatterns.interpreter;
public class And extends Expression
{
/**
* @link aggregation
*/
private Expression left, right;
public And(Expression left, Expression right)
{
this.left = left;
this.right = right;
}
public boolean interpret(Context ctx)
{
return left.interpret(ctx) && right.interpret(ctx);
}
public boolean equals(Object o)
{
if (o != null && o instanceof And)
{
return this.left.equals(((And) o).left) &&
this.right.equals(((And) o).right);
}
return false;
}
public int hashCode()
{
return (this.toString()).hashCode();
}
public String toString()
{
return "(" + left.toString() + " AND " + right.toString() + ")";
}
}
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