java set to string

Author: JavaProgramTo.com

src/main/java/com/javaprogramto/java8/listoflists/ListOfListsIntegers.java

@@ -0,0 +1,50 @@
+package com.javaprogramto.java8.listoflists;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class ListOfListsIntegers {
+
+	public static void main(String[] args) {
+
+		List<List<Integer>> listOfLists = new ArrayList<>();
+
+		List<Integer> innerList1 = new ArrayList<>();
+
+		innerList1.add(1);
+		innerList1.add(2);
+		innerList1.add(3);
+
+		List<Integer> innerList2 = new ArrayList<>();
+
+		innerList2.add(4);
+		innerList2.add(5);
+		innerList2.add(6);
+
+		listOfLists.add(innerList1);
+		listOfLists.add(innerList2);
+
+		// System.out.println("Integer List of lists - "+listOfLists);
+
+		for (List<Integer> list : listOfLists) {
+
+			for (Integer i : list) {
+				System.out.println(i);
+			}
+		}
+
+		listOfLists.forEach(
+				(List<Integer> innerList) -> 
+						innerList.forEach((Integer item) -> System.out.println(item)
+							)
+				);
+		
+		List<Integer> ints = listOfLists.stream()
+										.flatMap(list -> list.stream())
+										.collect(Collectors.toList());
+		System.out.println("flat map ints - "+ints);
+
+	}
+
+}

src/main/java/com/javaprogramto/java8/listoflists/ListOfListsStrings.java

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+package com.javaprogramto.java8.listoflists;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class ListOfListsStrings {
+
+	public static void main(String[] args) {
+
+		List<List<String>> listOfLists = new ArrayList<>();
+
+		List<String> innerList1 = new ArrayList<>();
+
+		innerList1.add("A");
+		innerList1.add("B");
+		innerList1.add("C");
+
+		List<String> innerList2 = new ArrayList<>();
+
+		innerList2.add("D");
+		innerList2.add("E");
+		innerList2.add("F");
+
+		listOfLists.add(innerList1);
+		listOfLists.add(innerList2);
+
+		// System.out.println("List of lists - "+listOfLists);
+
+		for (List<String> list : listOfLists) {
+
+			for (String letter : list) {
+				System.out.println(letter);
+			}
+		}
+
+		listOfLists.forEach(
+				(List<String> innerList) -> 
+						innerList.forEach((String item) -> System.out.println(item))
+				);
+		
+
+		List<String> strings = listOfLists.stream()
+										.flatMap(list -> list.stream())
+										.collect(Collectors.toList());
+		System.out.println("flat map strings - "+strings);
+	}
+}

src/main/java/com/javaprogramto/java8/set/tostring/ApacheCommonsSetToStringExample.java

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+package com.javaprogramto.java8.set.tostring;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.commons.lang3.StringUtils;
+
+public class ApacheCommonsSetToStringExample {
+
+	public static void main(String[] args) {
+
+		Set<String> hashSet = new HashSet<>();
+
+		hashSet.add("list");
+		hashSet.add("set");
+		hashSet.add("map");
+
+		String str1 = StringUtils.join(hashSet);
+
+		System.out.println("with default delimiter");
+		System.out.println("hashset in string - " + str1);
+
+		String str2 = StringUtils.join(hashSet, ":");
+
+		System.out.println("with custom delimiter");
+		System.out.println("hashset in string - " + str2);
+
+	}
+}

src/main/java/com/javaprogramto/java8/set/tostring/Java8SetToStringExample1.java

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+package com.javaprogramto.java8.set.tostring;
+
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+public class Java8SetToStringExample1 {
+
+	public static void main(String[] args) {
+
+		Set<String> hashSet = new HashSet<>();
+
+		hashSet.add("java");
+		hashSet.add("c++");
+		hashSet.add("python");
+
+		String str1 = String.join(" ", hashSet);
+
+		System.out.println("String.join() hashset in string - " + str1);
+
+		Set<String> linkedHashSet = new LinkedHashSet<>();
+
+		linkedHashSet.add("javascript");
+		linkedHashSet.add("typescript");
+
+		String str2 = String.join(" ", linkedHashSet);
+		System.out.println("String.join() linkedhashset in string - " + str2);
+		
+		System.out.println("With different delimiter");
+		String str3 = String.join("**", hashSet);
+
+		System.out.println("String.join() hashset to string - " + str3);
+
+		String str4 = String.join("^^", linkedHashSet);
+		System.out.println("String.join() linkedhashset to string - " + str4);
+	}
+}

src/main/java/com/javaprogramto/java8/set/tostring/Java8SetToStringExample2.java

@@ -0,0 +1,32 @@
+package com.javaprogramto.java8.set.tostring;
+
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class Java8SetToStringExample2 {
+
+	public static void main(String[] args) {
+
+		Set<String> hashSet = new HashSet<>();
+
+		hashSet.add("java");
+		hashSet.add("c++");
+		hashSet.add("python");
+
+		String str1 = hashSet.stream().collect(Collectors.joining(":", "{", "}"));
+		
+
+		System.out.println("Collectors.joining() hashset in string - " + str1);
+
+		Set<String> linkedHashSet = new LinkedHashSet<>();
+
+		linkedHashSet.add("javascript");
+		linkedHashSet.add("typescript");
+
+		String str2 = linkedHashSet.stream().collect(Collectors.joining(":", "{", "}"));
+		System.out.println("Collectors.joining() linkedhashset in string - " + str2);
+		
+	}
+}

src/main/java/com/javaprogramto/java8/set/tostring/SetToStringExample.java

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+package com.javaprogramto.java8.set.tostring;
+
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+public class SetToStringExample {
+
+	public static void main(String[] args) {
+
+		Set<String> hashSet = new HashSet<>();
+
+		hashSet.add("java");
+		hashSet.add("c++");
+		hashSet.add("python");
+
+		String str1 = hashSet.toString();
+		str1 = str1.replaceAll("\\,|\\[|\\]|\\s", " ");
+
+		System.out.println("hashset in string - " + str1);
+
+		Set<String> linkedHashSet = new LinkedHashSet<>();
+
+		linkedHashSet.add("javascript");
+		linkedHashSet.add("typescript");
+
+		String str2 = linkedHashSet.toString();
+		str2 = str2.replaceAll("\\,|\\[|\\]|\\s", " ");
+		System.out.println("linkedhashset in string - " + str2);
+
+	}
+
+}