How to use Java Collections utility class?

1. Description

There is a Collections class under the java.util package. It is a tool class that contains static methods. These methods cannot be instantiated. It provides a variety of methods for more efficient manipulation of all types of container objects.

2. Example

Out-of-the-box binary search algorithm:

Collections.binarySearch(list, 2);

You can directly reverse the list:

Collections.reverse(list);

You can use the shuffling algorithm to disrupt the list:

Collections.shuffle(list);

What are the advantages of Java

1. Simple, you only need to understand the basic concepts to write a program suitable for various situations. Application;

2. Object-oriented;

3. Distribution, Java is a network-oriented language;

4. Robustness, java provides automatic garbage collection to Carry out memory management to prevent programmers from making mistakes when managing memory;

5. Security, Java used in network and distributed environments must prevent virus intrusion;

6. Architecture neutral, as long as the Java runtime system is installed, it can run on any processor;

7. Portability, Java can be easily transplanted to different machines on the network;

8. Interpretation and execution. The Java interpreter directly interprets and executes the Java bytecode.

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