Java Math BigInteger.abs() 方法 Java Math BigDecimal.valueOf(long unscaledVal, int scale) Java Math BigInteger.add() 方法 Java Math BigInteger.abs() 方法 package com.codingdict; import java.math.*; public class BigIntegerDemo { public static void main(String[] args) { // create 4 BigInteger objects BigInteger bi1, bi2, bi3, bi4; // assign values to bi1, bi2 bi1 = new BigInteger("123"); bi2 = new BigInteger("-123"); // assign absolute values of bi1, bi2 to bi3, bi4 bi3 = bi1.abs(); bi4 = bi2.abs(); String str1 = "Absolute value of " + bi1 + " is " + bi3; String str2 = "Absolute value of " + bi2 + " is " + bi4; // print bi3, bi4 values System.out.println( str1 ); System.out.println( str2 ); } } Java Math BigDecimal.valueOf(long unscaledVal, int scale) Java Math BigInteger.add() 方法