JAVA (3).pdf

Which company originally developed Java? a. Microsoft b. IBM c. Sun Microsystems d. Google Answer: c What is the primary feature of Java that allows it to run on different platforms? a. Garbage Collection b. Multi-threading c. Object-oriented nature d. Write Once, Run Anywhere (WORA) Answer:...

Which company originally developed Java? a. Microsoft b. IBM c. Sun Microsystems d. Google Answer: c What is the primary feature of Java that allows it to run on different platforms? a. Garbage Collection b. Multi-threading c. Object-oriented nature d. Write Once, Run Anywhere (WORA) Answer: d Which software must be installed to run Java programs? a. Java Virtual Machine (JVM) b. Java Development Kit (JDK) c. Java Runtime Environment (JRE) d. Integrated Development Environment (IDE) Answer: c What is the Java compiler responsible for? a. Executing Java programs b. Converting source code into bytecode c. Interpreting bytecode into machine code d. Managing Java libraries Answer: b Which of the following is a feature of the Java Runtime Environment (JRE)? a. Provides class libraries b. Converts bytecode to machine code c. Compiles Java source files d. Manages network protocols Answer: a What is bytecode in Java? a. The machine code produced by the JVM b. An intermediate code that is platform-independent c. The source code written by the programmer d. A command line code for Java execution Answer: b Which of the following is a reserved word in Java?  a. method b. static c. Number d. System Answer: b Which keyword in Java is used to prevent a method from returning a value? a. return b. private c. static d. void Answer: d What is a class in Java? a. A method used to initialize variables b. A collection of objects and methods c. A type of loop structure d. A package that contains libraries Answer: b Which data type would you use to store true/false values in Java? a. int b. boolean c. float d. char Answer: b In the program public static void main(String[] args), what does String[] args represent? a. A method return type b. An array of command-line arguments c. The name of the class d. A Java keyword Answer: b Which method is always required in a Java application? a. start() b. print() c. main() d. execute() Answer: c Java uses both a compiler and an interpreter to run programs. The compiler translates Java code into _____. a. machine code b. binary code c. bytecode d. assembly code Answer: c Which of the following is NOT a benefit of Java? a. Active community support b. Inbuilt garbage collection c. Platform independence d. Hardware-specific dependencies Answer: d What is the output of the following code: a. Prints: Hello, Java b. Prints: "Hello, Java" c. Error: missing quotes d. Nothing, it only compiles Answer: a What type of comment is in Java? a. Single-line comment b. Multi-line comment c. Javadoc comment d. String literal Answer: b Which of the following is used to handle errors in Java? a. int b. try-catch block c. static method d. boolean Answer: b What does the System.out.println method do in Java? a. Saves the program b. Compiles the code c. Prints output to the console d. Initializes variables Answer: c Which of the following is NOT a valid identifier in Java? a. $myValue b. _count c. 5thValue d. myVar Answer: c Which command is used to compile a Java program? a. javac b. java c. jre d. jvm Answer: a True/False Questions (21-25) Java is considered a platform-independent language. Answer: True In Java, the keyword public makes a method or class accessible to all other classes. Answer: True The Java interpreter converts source code directly into machine code. Answer: False (It converts bytecode to machine code) The Java keyword main is used to define variables. Answer: False (It defines the main method) Java does not allow the use of underscores (_) in variable names. Answer: False (Underscores are allowed in variable names) Fill-in-the-Blank Questions (26-30) The process of converting Java source code into bytecode is done by the __________. Answer: Java compiler In a Java program, the main method must always be declared as __________. Answer: static A method that does not return a value is declared with the keyword __________. Answer: void The Java Development Kit (JDK) includes the __________ and tools for developing Java applications. Answer: Java Runtime Environment (JRE) The Java command javac is used to __________ Java programs. Answer: compile