What are the eleven criteria that the core API of Java needs to master?

Java core API needs to master the eleven criteria are what, many novices are not very clear about this, in order to help you solve this problem, the following small series will explain in detail for everyone, there are people who need this can learn, I hope you can harvest.

The eleven guidelines for Java core APIs are as follows:

1. Flexible use of functions of more than 80% of classes under java.lang package.

2. Flexible use of more than 80% of the classes under java.util package, especially the collection class system, regular expressions, time, attributes, and Timer.

3. Use more than 60% of the classes under java.io package, understand the design idea of IO system based on pipeline model, and the characteristics and use occasions of common IO classes.

100% of java. math.

More than 60% of the content under the java.net package is familiar with the functions of each class.

More than 60% of the content under java.text package, especially various formatting classes.

7, Java core API master needs to be able to skillfully use JDBC.

8, java.security package under more than 40% of the content, if there is no contact for security, it is impossible to master java.

9. Basic contents of AWT, including various component events, listeners, layout manager, common components, printing.

The basic content of Swing is similar to AWT requirements.

XML processing, familiar with the advantages and disadvantages of SAX, DOM and JDOM and able to use one of them to complete XML parsing and content processing.

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