ifcondition.java

System.out.println("===Program Started===");

class TestClass {
  
  public final String name;
  public final int age;

  public TestClass(String name, int age) {
    this.name = name;
    this.age = age;
  }
  
  public void sayMyName() {
    System.out.println("My name is " + this.name);
  }
  
  public int getAge() {
    return age;
  }
  
}

String myName = "Israel";

TestClass testClass = new TestClass(myName, 16);

// testClass.sayMyName();


// INFO IFs

final String personName = "Israel";
final int personAge = 16;
final ArrayList<Integer> listOfAges = new ArrayList<Integer>();

listOfAges.add(12);
listOfAges.add(14);

System.out.println("This is the age: " + testClass.getAge());

if (listOfAges.isEmpty()) {
  System.out.println("This is the if block... line 1");
  System.out.println("This is the if block... line 2");
  System.out.println("This is the if block... line 3");
  System.out.println("This is the if block... line 4");
} else {
  // INFO else
  System.out.println("Oh no!");
  System.out.println("The list is not empty!");
  System.out.println("Gosh!!!");
}

// INFO if-else if

if (true) {}

if (false) {}

if (2 == 2) {}

if (testClass.getAge() == 6) {
  System.out.println("This is for true");
} else if (testClass.getAge() == 15) {
  System.out.println("This is for false");
} else if (testClass.getAge() == 14) {
  System.out.println("This is for testClass.getAge() == 16");
} else {
  System.out.println("This is for the else block");
}

// INFO switch
final String switchConditionalVariable = "This"
final int magicNumber = 4;

switch (magicNumber - 6) {
  
  case 2:
    System.out.println("This is for case -> 2");
    break;
  
  case 3:
    System.out.println("This is for case -> 3");
    break;
  
  case 4:
    System.out.println("This is for case -> 4");
    break;
  
  case 5:
    System.out.println("This is for case -> 5");
    break;
  
  default:
    System.out.println("This is for default");
    break;
  
}


System.out.println("This is in the global scope and not part of the if block");


System.out.println("===Program Ended===");

loops.java

// for (int i = 1; i < 5; i++) {
//   System.out.println("This is a loop: " + i);
// }

// int i;

// for (i = 1; i < 5; i++) {
//   System.out.println("This is a loop: " + i);
// }

// int i;

// for (i = 1; i < 5;) {
//   System.out.println("This is a loop: " + i);
//   i++;
// }

// int i = 1;

// for (; i < 5;) {
//   System.out.println("This is a loop: " + i);
//   i++;
// }

// int[] arrayOfIntegers = {1,2,3,4,5};

// for (int i : arrayOfIntegers) {
//   System.out.println("item: " + i);
// }

// INFO While loop

// int i = 1;

// while (i < 5) {
//   System.out.println("This is a loop: " + i);
  
//   i++;
// }

// INFO do...while

int i = 1;

do {
  System.out.println("This is a loop: " + i);
  
  // INFO break
  // if (i == 2) {
  //   // INFO When i equals 2 stop right here
  //   break;
  // }

  System.out.println("last print statement");

  // INFO continue
  if (i == 2) {
    // INFO When i equals 2 skip this iteration
    continue;
  }
  
  i++;
} while (i < 5);

w3s-question.java

/*

Write a Java program that takes three numbers from the user and prints the greatest number.

Test Data
Input the 1st number: 25
Input the 2nd number: 78
Input the 3rd number: 87
Expected Output :
The greatest: 87

*/

// Scanner scanner = new Scanner(System.in);

// System.out.print("Input numOne: ");
// int numOne = scanner.nextInt();
// System.out.println();

// System.out.print("Input numTwo: ");
// int numTwo = scanner.nextInt();
// System.out.println();

// System.out.print("Input numThree: ");
// int numThree = scanner.nextInt();
// System.out.println();

final int numOne = 25;
final int numTwo = 78;
final int numThree = 87;

// INFO Using IFs

if (numOne > numTwo && numOne > numThree) {
  System.out.println(numOne + " is the greatest!");
}

if (numTwo > numOne && numTwo > numThree) {
  System.out.println(numTwo + " is the greatest!");
}

if (numThree > numOne && numThree > numTwo) {
  System.out.println(numThree + " is the greatest!");
}

// INFO IF...ELSE

if (numOne > numTwo && numOne > numThree) {
  System.out.println(numOne + " is the greatest!");
}

if (numTwo > numOne && numTwo > numThree) {
  System.out.println(numTwo + " is the greatest!");
} else {
  System.out.println(numThree + " is the greatest!");
}

// INFO IF...ELSE IF

if (numOne > numTwo && numOne > numThree) {
  System.out.println(numOne + " is the greatest!");
} else if (numTwo > numOne && numTwo > numThree) {
  System.out.println(numTwo + " is the greatest!");
} else if (numThree > numOne && numThree > numTwo) {
  System.out.println(numThree + " is the greatest!");
}