java如何对两个超大数相加

public class Test...{
    public static void main(String[] args){
        String a="123456789123456789";
        String b = "123456789123456789"    ;
        
        
        java.math.BigInteger a2 = new java.math.BigInteger(a);
        java.math.BigInteger b2 = new java.math.BigInteger(b);
        
                          java.math.BigInteger result=a2.add(b2);
        
        System.out.println (result );
    }
    
}

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