What is the Java Virtual Machine (JVM)?

The JVM is a runtime environment that executes Java bytecode and provides platform independence, memory management, and garbage collection for Java applications.

What is the difference between JDK and JRE?

The JDK includes tools for developing Java applications, while the JRE provides the runtime environment required to execute Java programs.

What are Java collections?

Java collections are data structures from the java.util package, such as List, Set, and Map, that provide methods for storing, accessing, and manipulating groups of objects.

Java Interview Questions

71. How does type erasure work?

72. What are bounded wildcards in generics?

73. What are PECS principles in Java generics?

74. What is multithreading in Java?

75. What is the difference between processes and threads?

76. How do threads work in Java?

77. What is the difference between Runnable and Callable?

78. What are synchronization and locks in Java?

79. What is the difference between synchronized methods and synchronized blocks?

80. What are volatile variables?