Category: Java

The TreeSet in Java is a subclass of Set. The TreeSet collection is used to sort ...

In modern software development, system functions are becoming more and more complex, and the method ...

Final keywordAccording to the context of the program, the Java keyword final has the meaning of “thi ...

Static code block: declared with staitc, executed when the jvm loads the class, only onceConstructin ...

The JDK concurrency package provides several very useful tool classes. These tool classes provide us ...

TreeMapIn the Map collection framework, in addition to HashMap, TreeMap is also one of the collectio ...

All data is stored in binary form in the computer. Bit operations are actually operations on the bin ...

PriorityQueueThe PriorityQueue class was introduced in Java 1.5. PriorityQueue is an unbounded queue ...

Java 8 introduced Optional class to avoid NullPointerException. Basically Optional class is a contai ...

When using Jackson to deserialize a Json string, if the Java object does’t include all the fields in ...