Java：如何定义基于Integer的自定义数据类型？ [英] Java: How to define custom Integer-based data type?

问题描述

我需要一个与Integer完全相同的数据类型，我希望它能溢出并下溢到某些值。换句话说，我想设置Integer类的对象/实例的MAX_VALUE和MIN_VALUE。问题是MAX_VALUE和MIN_VALUE是常量，最后是Integer类。我该怎么办？

I need a data type that behaves completely like Integer with this difference that I want it to overflow and underflow to certain values. On the other words, I'd like to set the MAX_VALUE and MIN_VALUE of an object/instance of the Integer class. The problem is MAX_VALUE and MIN_VALUE are constant and Integer class in final. How should I approach?

推荐答案

你必须创建自己的包装类：

You'll have to create your own wrapper class:

public class CustomInteger
{
    public static final int MAX_VALUE = 5000;
    public static final int MIN_VALUE = -5000;

    private final int value;

    public CustomInteger(int value)
    {
        // TODO: Validation
        this.value = value;
    }

    // Add all the methods you want - e.g. integer operations etc
    // performing custom overflow/underflow on each operation
}

您需要决定是否需要为整个类型设置一对固定限制，或者每个实例是否可以具有不同的限制（以及将两个具有不同限制的值加在一起时的含义等）。

You need to decide whether you want one fixed pair of limits for the whole type, or whether each instance can have a different limit (and what that means when adding together two values with different limits etc).

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