design pattern program for thread

DesignPattern/src/com/akash/singletonforThread/RunnerThreadEnviroment.java

@@ -0,0 +1,15 @@
+package com.akash.singletonforThread;
+
+public class RunnerThreadEnviroment {
+
+	public static void main(String[] args) {
+		// TODO 
+
+		/* Calling the thread singleton  */
+
+		SingletonThreadEnviroment singleton = SingletonThreadEnviroment.getInstance();
+
+		System.out.println(singleton);
+	}
+
+}

DesignPattern/src/com/akash/singletonforThread/SingletonThreadEnviroment.java

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+package com.akash.singletonforThread;
+
+public class SingletonThreadEnviroment {
+
+	private static volatile SingletonThreadEnviroment singletonInstance = null;
+
+	private SingletonThreadEnviroment() {}
+
+	public static SingletonThreadEnviroment getInstance() {
+		if(singletonInstance == null) {
+			synchronized(SingletonThreadEnviroment.class) {
+				if(singletonInstance == null) {
+					singletonInstance = new SingletonThreadEnviroment();
+				}
+			}	
+		}
+		return singletonInstance;
+	}
+}

Program/src/com/akash/latestProgram/NonRepeatCharFromString.java

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+package com.akash.latestProgram;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class NonRepeatCharFromString {
+
+	public static void main(String[] args) {
+		firstNonRepeatedChar();
+		nonRepeatedChar();
+    }
+
+	private static void nonRepeatedChar() {
+		// TODO 
+
+		String str = "akashkumar";
+
+		HashMap<Character, Integer> map = new HashMap<>();
+
+		for(int i = 0; i<str.length(); i++) {
+
+			char ch = str.charAt(i);
+
+			if(map.containsKey(ch)) {
+				int count = map.get(ch);
+				map.put(ch, count+1);
+
+			}else {
+				map.put(ch, 1);
+			}
+		}
+
+		for(Map.Entry<Character, Integer> entry : map.entrySet()) {
+			if(entry.getValue()!= 1)
+			System.out.print(entry.getKey()+"");
+		}	
+	}
+
+	private static void firstNonRepeatedChar() {
+		// TODO 
+		String s = "java";
+        for(Character ch:s.toCharArray()) {
+            if(s.indexOf(ch) == s.lastIndexOf(ch)) {
+                System.out.println("First non repeat character = " + ch);
+                break;
+            }
+        }
+	}
+}