package top.qaqaq.java.P494;

import org.junit.jupiter.api.Test;

import java.math.BigDecimal;
import java.math.BigInteger;

/**
 * 其他常用类的使用
 * 1.System
 * 2.Math
 * 3.BigInteger 和 BigDecimal
 *
 * @author RichieZhang
 * @create 2022-10-23 下午 10:27
 */
public class OtherClassTest {

    @Test
    public void test1() {
        String javaVersion = System.getProperty("java.version");
        System.out.println("java的version:" + javaVersion);

        String javaHome = System.getProperty("java.home");
        System.out.println("java的home:" + javaHome);

        String osName = System.getProperty("os.name");
        System.out.println("os的name:" + osName);

        String osVersion = System.getProperty("os.version");
        System.out.println("os的version:" + osVersion);

        String userName = System.getProperty("user.name");
        System.out.println("user的name:" + userName);

        String userHome = System.getProperty("user.home");
        System.out.println("user的home:" + userHome);

        String userDir = System.getProperty("user.dir");
        System.out.println("user的dir:" + userDir);
    }

    @Test
    public void test2() {
        BigInteger bi = new BigInteger("124332411231231321114411414142141241414142141421231123");
        BigDecimal bd = new BigDecimal("12435.351");
        BigDecimal bd2 = new BigDecimal("11");
        System.out.println(bi);
        System.out.println(bd.divide(bd2));
        System.out.println(bd.divide(bd2, BigDecimal.ROUND_HALF_UP));
        System.out.println(bd.divide(bd2, 25, BigDecimal.ROUND_HALF_UP));

        //项目中涉及到计算金额的, 部分代码如下, 编译器提示ROUND_HALF_UP is deprecated. 不推荐使用.
        // 从java9就不推荐使用了.修改方案:将BigDecimal.ROUND_HALF_UP改为:RoundingMode.HALF_UP
    }
}