Java 8 and streams with practial examples

.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_X" project-jdk-name="openjdk-19" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
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.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/Sample.iml" filepath="$PROJECT_DIR$/Sample.iml" />
+    </modules>
+  </component>
+</project>
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Sample.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
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src/Employee.java

+import java.util.List;
+
+public class Employee {
+
+    public Integer getId() {
+        return id;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    @Override
+    public String toString() {
+        return "Employee{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", phoneNumbers=" + phoneNumbers +
+                ", age=" + age +
+                ", dep='" + dep + '\'' +
+                ", sal=" + sal +
+                '}';
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    private Integer id;
+    private String name;
+    private String lastName;
+
+    public List<Long> getPhoneNumbers() {
+        return phoneNumbers;
+    }
+
+    public void setPhoneNumbers(List<Long> phoneNumbers) {
+        this.phoneNumbers = phoneNumbers;
+    }
+
+    private List<Long> phoneNumbers;
+
+    public Employee(Integer id, String name, String lastName, List<Long> phoneNumbers, Integer age, String dep, Double sal) {
+        this.id = id;
+        this.name = name;
+        this.lastName = lastName;
+        this.phoneNumbers = phoneNumbers;
+        this.age = age;
+        this.dep = dep;
+        this.sal = sal;
+    }
+
+    private Integer age;
+    private String dep;
+    private Double sal;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+
+    public String getDep() {
+        return dep;
+    }
+
+    public void setDep(String dep) {
+        this.dep = dep;
+    }
+
+    public Double getSal() {
+        return sal;
+    }
+
+    public void setSal(Double sal) {
+        this.sal = sal;
+    }
+
+
+}

src/Flux.java

+import java.util.*;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+
+ class test1 extends Thread{
+
+     @Override
+     public void run() {
+         System.out.println("in run method  running.........");
+     }
+ }
+
+class test2 extends test1{
+
+}
+
+public class Flux {
+
+    public static void main(String[] args) {
+
+        String str1="Scaler";
+        System.out.println(str1.hashCode());
+         str1 = str1.concat("avc");
+        System.out.println(str1.hashCode());
+        String str2="Scaler";
+        System.out.println(str2.hashCode());
+        String str3=new String("Scaler");
+        System.out.println(str1==str2);
+        //true because both points to same memory allocation
+
+        System.out.println(str1==str3);
+        //false because str3 refers to instance created in heap
+
+        System.out.println(str1.equals(str3));
+
+        System.out.println(str1.substring(4));
+
+
+
+    }
+}
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