5.1 Testing

 PackageSizeys;ImportJava.text.DecimalFormat;ImportJava.util.Scanner; Public classH { Public Static voidMain (string[] args) {Scanner Scanner=NewScanner (system.in); Try{System.out.print ("Please enter the first number:"); Doublex =scanner.nextdouble (); System.out.print ("Please enter a second number:"); Doubley =scanner.nextdouble (); System.out.print ("Please enter operator:"); String s=Scanner.next (); Charz = S.charat (0);        Js.yunsuan (x, y, z); } Catch(Exception e) {System.out.println ("Please enter the correct data!" "); }    }} PackageSizeys;ImportJava.text.DecimalFormat; Public classJS { Public Static voidYunsuan (DoubleXDoubley, Character z) {DecimalFormat R=NewDecimalFormat (); R.applypattern ("#0.00"); if(Z.equals (' + ')) {jia.yunsuan1 (x, y); //System.out.println (x + "+" + y + "=" + R.format ((x + y));}Else if(Z.equals ('-')) {jia.yunsuan2 (x, y); //System.out.println (x + "-" + y + "=" + R.format ((x-y)));}Else if(Z.equals (' * ')) {jia.yunsuan3 (x, y); //System.out.println (x + "*" + y + "=" + R.format ((x * y));}Else if(Z.equals ('/'))) {            if(y = = 0) {System.out.println ("Dividend cannot be 0"); } Else{jia.yunsuan4 (x, y); //System.out.println (x + "/" + y + "=" + R.format ((x/y)));            }        } Else{System.out.println ("Change operator not recognized"); }    }} PackageSizeys;ImportJava.text.DecimalFormat; Public classJia { Public Static DoubleYunsuan1 (DoubleXDoubley) {DecimalFormat R=NewDecimalFormat (); R.applypattern ("#0.00"); SYSTEM.OUT.PRINTLN (x+ "+" + y + "=" + r.format (x +( y))); returnX +y; }     Public Static DoubleYunsuan2 (DoubleXDoubley) {DecimalFormat R=NewDecimalFormat (); R.applypattern ("#0.00"); SYSTEM.OUT.PRINTLN (x+ "-" + y + "=" + R.format (X-( y))); returnX-y; }     Public Static DoubleYUNSUAN3 (DoubleXDoubley) {DecimalFormat R=NewDecimalFormat (); R.applypattern ("#0.00"); SYSTEM.OUT.PRINTLN (x+ "*" + y + "=" + R.format (x *( y))); returnX *y; }     Public Static DoubleYunsuan4 (DoubleXDoubley) {DecimalFormat R=NewDecimalFormat (); R.applypattern ("#0.00"); SYSTEM.OUT.PRINTLN (x+ "/" + y + "=" + R.format ((X/( y))); returnX/y; }} PackageSizeys;Import Staticorg.junit.assert.*;Importorg.junit.Test; Public classjiatest {@SuppressWarnings ("Static-access") @Test Public voidtestYunsuan1 () {Jia Core1=NewJia (); DoubleA = Core1.yunsuan1 (9,-3); //Test: 9 and 3 incoming in my Add method, the result will be 6? //Assertequals (6, a);} @Test Public voidtestYunsuan2 () {Jia Core2=NewJia (); Doubleb = core2.yunsuan2 (9, 4); } @Test Public voidtestYunsuan3 () {Jia Core3=NewJia (); Doublec = CORE3.YUNSUAN3 (9,-1); } @Test Public voidTestYunsuan4 () {Jia Core4=NewJia (); DoubleD = Core4.yunsuan4 (9, 5); }}

The following are black-box and white-Box testing techniques:

1. Black box method test. The test is primarily to test the functionality and use of the code in terms of user perspective:

Test Cases	Input criteria	Valid equivalence classes	Invalid equivalence class
Question Validity judgment	Allow only numbers	8	OP
Validity judgment of input characters	(8,2,OP)	8,2	OP

Test object	Test instructions	Test data	Test results
Number of topics	Enter illegal data	T	Please enter the correct data!
Subtraction Calculation	Wrong input symbol	5 6 O	The operator is not recognized
Calculation range	Accuracy	11.0 and 11 and 11.00	That's right

2. White box method test. Detailed examination of the procedural details of the software.

Test Cases	Use case description	Actual results
Additive processing	1.2+2.3	3.50
Subtraction Processing	9-4.2	4.80
Multiplication processing	11*3.0	33.00
Division Processing	8.0/2	4.0
Except 0 processing	5.0/0	Throw exception
Code Coverage	100%	100%

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5.1 Testing