Java Journal Land

  Continue and Break Instructions in Java   1. Continue Statement: The "continue" statement serves as a control tool for loops. When applied, it allows you to skip the current iteration of the loop and proceed directly to the next one, enhancing code efficiency by avoiding unnecessary operations. 2. Break Statement: The "break" statement acts as an exit mechanism within loops, offering immediate termination regardless of whether the loop's defined condition has been met. It's a valuable tool to have precise control over loop execution.    

What Are Java Labels?   Labels in Java are identifiers used to mark a specific point within code blocks. When dealing with nested loops, labels help you control which loop you exit from or continue within.  They work with break and continue statements to give you more control over your loops. myLabel: // This is a label for ( int i = 0; i < 3; i++) { for ( int j = 0; j < 3; j++) { if (j == 1) { break myLabel; // Exits the outer loop } System.out.println ( "i: " + i + ", j: " + j ); } } Labels make your code clearer when you have complex loops. They let you exit or skip multiple loops at once, making your code easier to read and debug. They offer better control over nested loops. Keep them in mind for those tricky scenarios.

Definition A functional interface in Java must have exactly one abstract method and may have other default or static methods. Example @FunctionalInterface public interface Calculator {    int add ( int a, int b );    default void log ( String message ) {      System.out.println ( "Log: " + message );   }    static void showResult ( int result ) {      System.out.println ( "Result: " + result );   } } // Using Lambda Calculator calculator = ( a, b ) -> a + b ; int result = calculator.add ( 5, 3 ); Calculator.showResult ( result );   A default method in an interface offers a built-in implementation that can be replaced by any class using it. This feature is exclusive to interfaces.

In Java, each primitive data type has a default value automatically assigned when declaring an uninitialized variable.   Understanding these default values is essential to prevent runtime errors. Below is a table summarizing this information.   Data Type Default Value byte 0 char '\u0000' short 0 int 0 float 0.0f long 0L double 0.0d

Quick Reminder:   Java's primitive types and their sizes : Data Type Size char 2 bytes (16 bits) short 2 bytes (16 bits) int 4 bytes (32 bits) float 4 bytes (32 bits) long 8 bytes (64 bits) double 8 bytes (64 bits)