This document provides an introduction to Java programming, focusing on the concepts of classes, objects, and garbage collection. It outlines the standard garbage collection phases, including marking, sweeping, and compacting, as well as various types of garbage collectors such as serial, parallel, CMS, and G1. Additionally, it covers the Java stack class and its implementation and methods.

1. JAVA PROGRAMMING UNIT-
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Introduction to Java ,Classes and object

80. Phases of Garbage Collection in Java
• A standard Garbage Collection implementation involves three
phases:
• Mark objects as alive
• Sweep dead objects
• Compact remaining objects in memory

84. What is Generational Garbage Collection in Java?

87. Types of Garbage Collector
• Serial Garbage Collector
• Parallel Garbage Collector
• Concurrent Mark Sweep (CMS) Garbage Collector
• Garbage First (G1) Garbage Collector

90. Java stack class

91. Stack Implementation

92. Creating a stack

93. Stack methods