Java小專案-加減乘除Log4j-Logger、Junit4、BigDecimal、interface

主程式

package test2;

import static org.junit.Assert.*;

import java.math.BigDecimal;
import java.util.InputMismatchException;
import java.util.Scanner;

import org.apache.log4j.Logger;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import test2.service.implement1.impleMathCalculate;

public class TestMath {

	private static final Logger logger = Logger.getLogger(TestMath.class);
	impleMathCalculate mathcalculate = null;
	BigDecimal a = null;
	BigDecimal b = null;
	BigDecimal resultAdd = null;
	BigDecimal resultDiv = null;
	BigDecimal resultMulti = null;
	BigDecimal resultSub = null;

	@Before
	public void setUp() throws Exception {
		a = new BigDecimal("0");
		b = new BigDecimal("0");
		resultAdd = new BigDecimal("0");
		resultDiv = new BigDecimal("0");
		resultMulti = new BigDecimal("0");
		resultSub = new BigDecimal("0");
		
		
		Scanner scanner = new Scanner(System.in);
		logger.info("請輸入第一個數字:");
		checkValue(scanner, "1");

		logger.info("請輸入第二個數字:");
		checkValue(scanner, "2");

		mathcalculate = new impleMathCalculate();
	}

	private void checkValue(Scanner scanner, String flag) {

		try {
			if (flag.equals("1")) {
				a = scanner.nextBigDecimal();
			} else {
				b = scanner.nextBigDecimal();
			}

		} catch (InputMismatchException e) {
			logger.error("不得為文字!!");
		}
	}

	@Test
	public void test() {
		resultAdd = mathcalculate.Add(a, b);
		resultDiv = mathcalculate.Div(a, b);
		resultMulti = mathcalculate.Multi(a, b);
		resultSub = mathcalculate.Sub(a, b);
		
	}

	@After
	public void tearDown() throws Exception {
		logger.info(resultAdd);
		logger.info(resultDiv);
		logger.info(resultMulti);
		logger.info(resultSub);
	}

}

承接interface 用implement實作

package test2.service.implement1;

import java.math.BigDecimal;

import test2.service.interface1.IAdd;
import test2.service.interface1.IDiv;
import test2.service.interface1.IMulti;
import test2.service.interface1.ISub;

public class impleMathCalculate implements IAdd, IDiv, IMulti, ISub {
	BigDecimal add	=	new BigDecimal("0.0");
	BigDecimal sub	=	new BigDecimal("0.0");
	BigDecimal multi=	new BigDecimal("0.0");
	BigDecimal div	=	new BigDecimal("0.0");
	
	@Override
	public BigDecimal Add(BigDecimal a, BigDecimal b) {
		this.add = a.add(b);
		return add;
	}
	@Override
	public BigDecimal Sub(BigDecimal a, BigDecimal b) {
		this.sub = a.subtract(b);
		return sub;
	}

	@Override
	public BigDecimal Multi(BigDecimal a, BigDecimal b) {
		this.multi = a.multiply(b);
		return multi;
	}

	@Override
	public BigDecimal Div(BigDecimal a, BigDecimal b) {
		this.div = a.divide(b);
		return div;
	}


}

interface宣告的-加

package test2.service.interface1;

import java.math.BigDecimal;

public interface IAdd {
	public BigDecimal Add(BigDecimal a,BigDecimal b);
}

interface宣告的-減

package test2.service.interface1;

import java.math.BigDecimal;

public interface ISub {
	public BigDecimal Sub(BigDecimal a,BigDecimal b);
}

interface宣告的-乘

package test2.service.interface1;

import java.math.BigDecimal;

public interface IMulti {
	public BigDecimal Multi(BigDecimal a,BigDecimal b);
}

interface宣告的-除

package test2.service.interface1;

import java.math.BigDecimal;

public interface IDiv {
	public BigDecimal Div(BigDecimal a,BigDecimal b);
}

檔案配置

輸出情況

2019-10-28 02:05:05,605 INFO  test2.TestMath.setUp(TestMath.java:38) - 請輸入第一個數字:
10
2019-10-28 02:05:09,402 INFO  test2.TestMath.setUp(TestMath.java:41) - 請輸入第二個數字:
10
2019-10-28 02:05:10,826 INFO  test2.TestMath.tearDown(TestMath.java:72) - 20
2019-10-28 02:05:10,826 INFO  test2.TestMath.tearDown(TestMath.java:73) - 1
2019-10-28 02:05:10,827 INFO  test2.TestMath.tearDown(TestMath.java:74) - 100
2019-10-28 02:05:10,827 INFO  test2.TestMath.tearDown(TestMath.java:75) - 0