1Z0-811: Java Foundations Novice-level ExamDemo

Java permits String values as switch selectors, and String case labels are matched using String equality. Declaring var as String with the value "1" matches case "1":, so the print statement executes. Oracle: Strings in switch Statements

A try statement is associated with one or more catch blocks to handle exceptions. When an exception occurs, normal execution of the remaining statements in the try block stops, a try block does not have to throw an exception, and specific exception handlers must precede more general handlers.

A public type in another package can be used by its simple name after a single-type import that specifies its fully qualified name. import fruits.Grape; imports the public Grape class from fruits into the compilation unit in package cakes, allowing both the field declaration and constructor call to resolve. Java Language Specification, §7.5.1

Assigning num[1] = 20 replaces the array’s second value, while lst.add(20) appends a third value to the ArrayList; its initial capacity is not a fixed size limit. The loops therefore print the array as 10 20 and the list as 10 15 20 on the next line.

Because Bus explicitly declares only Bus(String type), no implicit no-argument constructor is supplied. The call new Bus() therefore does not compile. Declaring Bus() { } at line n1 provides the required overload, preserves the field’s initial value of "default", and allows the second constructor call to set the value to "luxury".

An instance method declared as int sum(int a, int b) accepts the two int values passed by obj.sum(10, 20). Returning a + b produces 30, which is concatenated into sum is 30.

Java does not allow a named method declaration within another method body. Methods may omit an access modifier, may take no parameters, may return void, and may be declared static final.

The JDK contains the tools required to develop Java applications, including tools such as the compiler and debugger.

Java is platform independent because compiled bytecode can run on a Java Virtual Machine across different operating systems and hardware architectures. It is robust through mechanisms including automatic memory management, type safety, and exception handling.

A variable identifier can contain letters and digits when it begins with a letter and contains no spaces or punctuation such as a dash. totalScore2 meets those identifier rules.

The comparison evaluates to false because 15 is not greater than or equal to 26. The else branch computes integer arithmetic: 5 / 3 evaluates to 1, and 1 + (10 * 2) evaluates to 21.

A final instance field cannot be reassigned after it has been initialized. The statement test.l = 99; attempts to reassign the final field l, so compilation fails in the modify method.

The call to print(100) prints 100, updates the static variable var2 from 200 to 300, and then invokes the zero-argument print() method. That method prints the updated value, producing 100300.

Primitive values can be tested for equality with the == operator. They do not provide object methods such as equals or compareTo.

Java class variables are static fields shared by every instance of a class. The declarations with the static modifier are the class variables.

Because A declares A(int pass) but no zero-argument constructor, the expression new A() is invalid and produces a compilation error.

The call to sayHello() prints Hello!. The overloaded sayHello("Queen") returns Hello, Queen, which the outer println prints on the following line.

Dividing an integer by zero throws an ArithmeticException. Because ArithmeticException is a subclass of Exception, it is caught within find(), which prints find() - exception; the exception does not propagate to main().

Prefix increment increments the variable before its value is used, while postfix increment uses the current value and increments afterward. The conditions evaluate as true, and ++b changes b from 11 to 12 before assigning 12 to a, so the printed value is 12.

For an empty ArrayList, add(int, E) permits only index 0. Calling items.add(1, "pen") uses an invalid index and throws an IndexOutOfBoundsException at runtime.

The string literal creates or reuses its pooled String object, new String("StringObjects") creates a separate String, and concatenating string1 with string2 creates a new result String. Assigning string1 to string2 copies only the reference.

this is a Java keyword that refers to the current object. true is the reserved boolean literal representing a true Boolean value. array, exception, and string are not reserved Java words.

Boxing the constant integer value 100 produces reference-identical Integer objects because 100 is within the required -128 to 127 range, so id1 == id2 is true. Separate new Item(100) expressions create separate object instances, so i1 == i2 is false.

Java cannot overload methods solely by changing their return type. Both declarations have the signature add(int), so they cause a duplicate-method compilation error.