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java8-programs
Commit 00df3f9f authored by Syed Ilyas Uddin's avatar Syed Ilyas Uddin
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java8 practice programs

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target/
!.mvn/wrapper/maven-wrapper.jar
!**/src/main/**/target/
!**/src/test/**/target/
### IntelliJ IDEA ###
.idea/modules.xml
.idea/jarRepositories.xml
.idea/compiler.xml
.idea/libraries/
*.iws
*.iml
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### Eclipse ###
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### NetBeans ###
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!**/src/main/**/build/
!**/src/test/**/build/
### VS Code ###
.vscode/
### Mac OS ###
.DS_Store
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# Default ignored files
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$" vcs="Git" />
</component>
</project>
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pom.xml 0 → 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>Java8-Practice</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
</dependency>
</dependencies>
</project>
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# Default ignored files
/shelf/
/workspace.xml
src/main/java/com/.idea/checkstyle-idea.xml 0 → 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="CheckStyle-IDEA" serialisationVersion="2">
<checkstyleVersion>10.12.5</checkstyleVersion>
<scanScope>JavaOnly</scanScope>
<copyLibs>true</copyLibs>
<option name="thirdPartyClasspath" />
<option name="activeLocationIds" />
<option name="locations">
<list>
<ConfigurationLocation id="bundled-sun-checks" type="BUNDLED" scope="All" description="Sun Checks">(bundled)</ConfigurationLocation>
<ConfigurationLocation id="bundled-google-checks" type="BUNDLED" scope="All" description="Google Checks">(bundled)</ConfigurationLocation>
</list>
</option>
</component>
</project>
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/out" />
</component>
</project>
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src/main/java/com/.idea/modules.xml 0 → 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectModuleManager">
<modules>
<module fileurl="file://$PROJECT_DIR$/Java8_Programs.iml" filepath="$PROJECT_DIR$/Java8_Programs.iml" />
</modules>
</component>
</project>
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src/main/java/com/.idea/vcs.xml 0 → 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$/../../../.." vcs="Git" />
</component>
</project>
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src/main/java/com/java8/Completable_Future/AsyncExample.java 0 → 100644
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package com.java8.Completable_Future;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
public class AsyncExample {
public static void delay(int seconds) {
try {
TimeUnit.SECONDS.sleep(seconds);
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
public static void main(String[] args) {
Runnable runnable = () -> {
delay(1000);
System.out.println("Im in a Runnable : " + Thread.currentThread().getName());
};
// Crating CompletableFuture object
CompletableFuture<Void> completableFuture = CompletableFuture.runAsync(runnable);
System.out.println("I'm in main: " + Thread.currentThread().getName());
// join method is used to wait for CompletableFuture to get complete
completableFuture.join();
}
}
src/main/java/com/java8/FindListOfStringInAscendingOrder.java 0 → 100644
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package com.java8;
public class FindListOfStringInAscendingOrder {
public static void main(String[] args) {
// Given List of Strings of numbers. Print the no.s in Ascending order
}
}
src/main/java/com/java8/Util/MyLogger.java
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/*
package com.java8.Util; package com.java8.Util;
...@@ -8,3 +9,4 @@ public class MyLogger { ...@@ -8,3 +9,4 @@ public class MyLogger {
public static final Logger consoleLogger = Logger.getLogger("consoleLogger"); public static final Logger consoleLogger = Logger.getLogger("consoleLogger");
} }
*/
src/main/java/com/java8/logical_Programs/Employee.java 0 → 100644
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package com.java8.logical_Programs;
public class Employee {
private int empId;
private String name;
private String dept;
public Employee(int empId, String name, String dept) {
this.empId = empId;
this.name = name;
this.dept = dept;
}
public int getEmpId() {
return empId;
}
public void setEmpId(int empId) {
this.empId = empId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDept() {
return dept;
}
public void setDept(String dept) {
this.dept = dept;
}
@Override
public String toString() {
return "Employee{" +
"empId=" + empId +
", name='" + name + '\'' +
", dept='" + dept + '\'' +
'}';
}
}
src/main/java/com/java8/logical_Programs/FindCountOfEmpInEachDept.java 0 → 100644
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package com.java8.logical_Programs;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
public class FindCountOfEmpInEachDept {
public static void main(String[] args) {
// Find count of employees in each department
List<Employee> employeeList = Arrays.asList(
new Employee(101, "Syed", "IT"),
new Employee(101, "Farhan", "HR"),
new Employee(101, "Soha", "IT"),
new Employee(101, "Faiz", "HR"),
new Employee(101, "Syed", "IT")
);
Map<String, Long> employeeCountByDept = employeeList.stream()
.collect(Collectors.groupingBy(Employee::getDept, Collectors.counting()));
System.out.println("Employees in each dept are: " + employeeCountByDept);
}
}
src/main/java/com/java8/logical_Programs/FindNumbersDivisibleByThree.java 0 → 100644
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package com.java8.logical_Programs;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
public class FindNumbersDivisibleByThree {
public static void main(String[] args) {
// Given list of numbers as String, find numbers which are divisible by 3.
List<String> listOfStr = Arrays.asList("3", "4", "21", "18", "24", "19", "30", "42");
// Converting list of String of elements --> into list of Integer of elements.
List<Integer> listOfNumbersDivByThree = listOfStr.stream()
.map(e -> Integer.parseInt(e))
.filter(num -> num % 3 == 0)
.collect(Collectors.toList());
System.out.println("Numbers which are divisible by 3 are:" + listOfNumbersDivByThree);
}
}
src/main/java/com/java8/logical_Programs/FindStringWithVowels.java 0 → 100644
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package com.java8.logical_Programs;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
public class FindStringWithVowels {
public static void main(String[] args) {
// Given list of String words, find words which starts with a vowel.
List<String> listOfStr = Arrays.asList("Hello", "Umbrella", "vehicle", "Garden", "Eden Garden", "owner");
List<String> wordsWithVowels = listOfStr.stream()
.filter(ch -> ch.toLowerCase().startsWith("a")
||ch.toLowerCase().startsWith("e")
||ch.toLowerCase().startsWith("i")
||ch.toLowerCase().startsWith("o")
||ch.toLowerCase().startsWith("u"))
.collect(Collectors.toList());
System.out.println("Words starting with String are: " + wordsWithVowels);
}
}
src/main/java/com/java8/logical_Programs/FlatMap_Example.java 0 → 100644
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package com.java8.logical_Programs;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
public class FlatMap_Example {
public static void main(String[] args) {
// FlatMap is the combination of Ma and flattening of Data.
// Merging list of lists into just 1 list is done with flatMap() intermediate operation.
List<Integer> evenList = Arrays.asList(2,4,6,8,10);
List<Integer> oddList = Arrays.asList(1,3,5,7,11);
List<Integer> primeList = Arrays.asList(17, 19, 23, 29, 31);
// converting list of even, odd, prime number lists into 1 list.
List<List<Integer>> flattenedList = Arrays.asList(evenList, oddList, primeList);
// using flatMap() operation to flatten the lists into 1 list.
List<Integer> finalList = flattenedList.stream().flatMap(s -> s.stream()).collect(Collectors.toList());
System.out.println(finalList);
}
}
src/main/java/com/java8/logical_Programs/PrintNumbersInAscendingOrder.java
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package com.java8.logical_Programs; package com.java8.logical_Programs;
import com.java8.Util.MyLogger;
import java.util.Arrays; import java.util.Arrays;
import java.util.List; import java.util.List;
import java.util.stream.Collectors; import java.util.stream.Collectors;
......
src/main/java/com/out/production/com/com/.idea/.gitignore 0 → 100644
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# Default ignored files
/shelf/
/workspace.xml
src/main/java/com/out/production/com/com/.idea/checkstyle-idea.xml 0 → 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="CheckStyle-IDEA" serialisationVersion="2">
<checkstyleVersion>10.12.5</checkstyleVersion>
<scanScope>JavaOnly</scanScope>
<copyLibs>true</copyLibs>
<option name="thirdPartyClasspath" />
<option name="activeLocationIds" />
<option name="locations">
<list>
<ConfigurationLocation id="bundled-sun-checks" type="BUNDLED" scope="All" description="Sun Checks">(bundled)</ConfigurationLocation>
<ConfigurationLocation id="bundled-google-checks" type="BUNDLED" scope="All" description="Google Checks">(bundled)</ConfigurationLocation>
</list>
</option>
</component>
</project>
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src/main/java/com/out/production/com/com/.idea/misc.xml 0 → 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/out" />
</component>
</project>
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src/main/java/com/out/production/com/com/.idea/modules.xml 0 → 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectModuleManager">
<modules>
<module fileurl="file://$PROJECT_DIR$/com.iml" filepath="$PROJECT_DIR$/com.iml" />
</modules>
</component>
</project>
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src/main/java/com/out/production/com/com/.idea/vcs.xml 0 → 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$/../../../.." vcs="Git" />
</component>
</project>
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