1. Which of these packages contain all the collection classes?a)java.utilb)java.awtc)java.netd) java.lang

Step 1: Break Down the Problem

We need to determine which package in Java contains all the collection classes. The options given are:

1. java.util
2. java.awt
3. java.net
4. java.lang

Step 2: Relevant Concepts

In Java, the collection classes are primarily found in the java.util package. This package includes interfaces and classes that are essential for collections, such as List, Set, Map, and various implementations like ArrayList, HashSet, and HashMap.

Step 3: Analysis and Detail

1. java.util: Contains the collection framework including lists, sets, and maps.
2. java.awt: This package is part of the Abstract Window Toolkit, which is used for creating graphical user interfaces (GUIs).
3. java.net: This package provides classes for networking applications.
4. java.lang: Contains fundamental classes that are essential to the Java programming language but does not include collection classes.

Step 4: Verify and Summarize

After analyzing each package, it is clear that only java.util contains all the collection classes needed for managing data collections.

Final Answer

The correct answer is a) java.util.