如何对无法存储在一个变量中的大数字进行操作

问题描述

在Java中，我希望能够对非常大的整数进行操作（不能长时间存储），我该怎么做？

In Java, I would like to be able to do operations on really big integers (that can't be stored in a long), how can I do that?

有什么最好的方法可以解决这个问题，表现如何？我应该创建自己的包含多个长变量的数据类型吗？

What is the best way to deal with this, with good performances? Should I create my own data type that contains several long variables?

示例：

public class MyBigInteger{
    private long firstPart;
    private long secondPart;

   ...
}

public MyBigInteger add(long a, long b){
    MyBigInteger res;

    // WHAT CAN I DO HERE, I guess I could do something with the >> << operators, but I've never used them!

    return res;
}

谢谢！

推荐答案

import java.math.BigInteger;

public class BigIntegerTest {

    public BigInteger add(long a, long b){
        BigInteger big1 = new BigInteger(Long.toString(a));
        BigInteger big2 = new BigInteger(Long.toString(b));

        return big1.add(big2);
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        System.out.println(new BigIntegerTest().add(22342342424323423L, 234234234234234234L));
    }

}

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