20155212Arrays和String测试_MySort

Arrays和String单元测试

在IDEA中以TDD的方式对String类和Arrays类进行学习

• 测试相关方法的正常，错误和边界情况
  • String类
    • charAt
    • split
  • Arrays类
    • sort
    • binarySearch
• 码云链接
• 代码

/**

 * Created by radish608 on 17-5-10.

 */

import java.util.*;

import org.junit.Test;

import static java.util.Arrays.binarySearch;

public class SAtest {

    String teststring1 = "Hello World!";

    String teststring2 = " ";

    String teststring3 = "boo:and:foo";

    String[] teststring4 = new String[3];

    String[] teststring5 = new String[3];

    @Test

    public void StringTester()  {

        assert teststring1.charAt(0) == 'H' : "error1:charAt";

        assert teststring1.charAt(teststring1.length()-1) == '!' : "error2:charAt";

        assert teststring2.charAt(0) == teststring2.charAt(teststring2.length()-1) : "error3:charAt";

        teststring4 = teststring3.split(":");

        teststring5 = teststring3.split("o");

        assert teststring4[0].equals("boo") : "error4:split";

        assert teststring4[1].equals("and") : "error5:split";

        assert teststring4[2].equals("foo"): "error6:split";

        assert teststring5[0].equals("b") : "error7:split";

        assert teststring5[1].equals("") : "error8:split";

        assert teststring5[2].equals(":and:f") : "error9:split";

    }

    @Test

    public void ArraysTester() {

        int []testarr1 = { 1, 3, 5, 4, 2, 0};

        int []testarr2 = {2, 5, 7, 8, 9, 0, 10, 11, 13, 15, 19};

        Arrays.sort(testarr1);

        assert testarr1[1] == 1 : "error10:sort";

        assert binarySearch(testarr2, 0, testarr2.length-1, 5) == 1 : "error11:binarySearch";

    }

}

• 截图
  
  

MySort

模拟实现Linux下Sort -t : -k 2的功能。参考 Sort的实现。提交码云链接和代码运行截图。

• 码云链接
• 代码

/**

 * Created by radish608 on 17-5-10.

 */

import java.util.*;

public class MySort1 {

    public static void main(String[] args) {

        String[] toSort = {"aaa:10:1:1",

                "ccc:30:3:4",

                "bbb:50:4:5",

                "ddd:20:5:3",

                "eee:40:2:20"};

        System.out.println("Before sort:");

        for (String str : toSort)

            System.out.println(str);

        System.out.println("After sort:");

        int[] tmp = new int[toSort.length];

        String[][] string = new String [toSort.length][4];

        for (int i = 0; i < toSort.length; i++) {

            string[i] = toSort[i].split(":");

            tmp[i] = Integer.parseInt(string[i][1]);

        }

        Arrays.sort(tmp);

        for (int i = 0; i < tmp.length; i++) {

            for (int j = 0; j < toSort.length; j++) {

                if(tmp[i] == Integer.parseInt(string[j][1])){

                    System.out.println(toSort[j]);

                }

            }

        }

    }

}

• 截图