Commit230ab06

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Add lottery snippet

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+47

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+47

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Lines changed: 16 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -22,6 +22,7 @@ Update the sample application with the snippet and add a test for it. After prov`
`22`	`22`	`###Math`
`23`	`23`	`*[Factorial](#factorial)`
`24`	`24`	`*[Fibonacci](#fibonacci)`
	`25`	`+*[Lottery](#lottery)`
`25`	`26`
`26`	`27`	`###Media`
`27`	`28`	`*[Capture screen](#capture-screen)`
`@@ -145,6 +146,21 @@ Update the sample application with the snippet and add a test for it. After prov`
`145`	`146`
`146`	`147`	`[⬆ back to top](#table-of-contents)`
`147`	`148`
	`149`	`+###Lottery`
	`150`	`+`
	`151`	+```java
	`152`	`+publicstaticInteger[] performLottery(int numNumbers,int numbersToPick) {`
	`153`	`+List<Integer> numbers=newArrayList<>();`
	`154`	`+for(int i=0; i< numNumbers; i++) {`
	`155`	`+ numbers.add(i+1);`
	`156`	`+ }`
	`157`	`+Collections.shuffle(numbers);`
	`158`	`+return numbers.subList(0, numbersToPick).toArray(newInteger[numbersToPick]);`
	`159`	`+ }`
	`160`	+```
	`161`	`+`
	`162`	`+[⬆ back to top](#table-of-contents)`
	`163`	`+`
`148`	`164`	`##Media`
`149`	`165`
`150`	`166`	`###Capture screen`

Lines changed: 16 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -6,9 +6,7 @@`
`6`	`6`	`importjava.nio.file.Files;`
`7`	`7`	`importjava.text.ParseException;`
`8`	`8`	`importjava.text.SimpleDateFormat;`
`9`		`-importjava.util.ArrayList;`
`10`		`-importjava.util.Arrays;`
`11`		`-importjava.util.Date;`
	`9`	`+importjava.util.*;`
`12`	`10`	`importjava.util.List;`
`13`	`11`
`14`	`12`	`/*`
`@@ -179,4 +177,19 @@ public static List<File> listAllFiles(String path) {`
`179`	`177`	`}`
`180`	`178`	`returnall;`
`181`	`179`	`}`
	`180`	`+`
	`181`	`+/**`
	`182`	`+ * Generate random lottery numbers`
	`183`	`+ * @param numNumbers how many performLottery numbers are available (e.g. 49)`
	`184`	`+ * @param numbersToPick how many numbers the player needs to pick (e.g. 6)`
	`185`	`+ * @return array with the random numbers`
	`186`	`+ */`
	`187`	`+publicstaticInteger[]performLottery(intnumNumbers,intnumbersToPick) {`
	`188`	`+List<Integer>numbers =newArrayList<>();`
	`189`	`+for(inti =0;i <numNumbers;i++) {`
	`190`	`+numbers.add(i+1);`
	`191`	`+ }`
	`192`	`+Collections.shuffle(numbers);`
	`193`	`+returnnumbers.subList(0,numbersToPick).toArray(newInteger[numbersToPick]);`
	`194`	`+ }`
`182`	`195`	`}`

Lines changed: 15 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -181,4 +181,19 @@ public void testListAllFiles() {`
`181`	`181`	`List<File>files =Library.listAllFiles("src/test/resources");`
`182`	`182`	`assertEquals(3,files.size());`
`183`	`183`	`}`
	`184`	`+`
	`185`	`+/**`
	`186`	`+ * Tests for {@link Library#performLottery(int, int)}`
	`187`	`+ */`
	`188`	`+@Test`
	`189`	`+publicvoidtestPerformLottery() {`
	`190`	`+Integer[]numbers0 =Library.performLottery(0,0);`
	`191`	`+assertArrayEquals(newInteger[]{},numbers0);`
	`192`	`+Integer[]numbers1 =Library.performLottery(1,1);`
	`193`	`+assertArrayEquals(newInteger[]{1},numbers1);`
	`194`	`+Integer[]numbers2 =Library.performLottery(2,2);`
	`195`	`+assertEquals(2,numbers2.length);`
	`196`	`+assertTrue(numbers2[0] ==1 \|\|numbers2[0] ==2);`
	`197`	`+assertTrue(numbers2[1] ==1 \|\|numbers2[1] ==2);`
	`198`	`+ }`
`184`	`199`	`}`

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