String is immutable and thread safe String builder mutable and not thread safe
Here is what the above code is Doing:
1. It creates a StringBuilder object.
2. It appends the string “Hello” to the StringBuilder object.
3. It appends the string “World” to the StringBuilder object.
4. It converts the StringBuilder object to a String object.
5. It prints the String object.
String value = “\”ROM\””; Here is what the above code is Doing: 1. We’re creating a new instance of the class called “my_dict” 2. We’re adding a key called “name” and a value called “John” to the dictionary 3. We’re adding a key called “age” and a value called “36” to the dictionary 4. We’re…
File myObj = new File(“path”); myObj.createNewFile(); FileWriter myWriter = new FileWriter(“path”); myWriter.write(“text”); myWriter.close(); Here is what the above code is Doing: 1. Create a new file called myObj. 2. Write the text “text” to the file. 3. Close the file.
@Test public void powerOfTheNumberProgram13() { Scanner scanner = new Scanner(System.in); System.out.println(“Enter any NUMBER: “); int number = scanner.nextInt(); System.out.println(“Enter the POWER: “); int power = scanner.nextInt(); scanner.close(); // Logic for finding the POWER of number int powerOfNumber = (int) Math.pow(number, power); System.out.println(“Power of a ” + number + “^” + power + “: ” +…
channel.sendMessage(content).queue((message) -> { long messageId = message.getIdLong(); // use messageId here }); Here is what the above code is Doing: 1. It sends a message to the channel. 2. It gets the message ID of the message that was sent. 3. It uses the message ID. The message ID is a long, so you can…
@Service , @Repsoitory Here is what the above code is Doing: 1. We are creating a class called UserService. 2. We are creating a method called getUserById. 3. We are creating a variable called userId and assigning it a value of 1. 4. We are creating a variable called user and assigning it a value…
long startTime = System.nanoTime(); methodToTime(); long endTime = System.nanoTime(); long duration = (endTime – startTime); //divide by 1000000 to get milliseconds. Here is what the above code is Doing: 1. We create a variable called startTime and set it equal to the current time in nanoseconds. 2. We call the method we want to time….