A picture is worth a thousand words, and the following diagrams are from the Java tutorials on Program Creek, which currently have the most votes. If the diagram doesn't explain the problem, then you can use its title to get a glimpse of it. 1. String immutability The following image shows what this code does.
2. The difference between the equals() method and the hashCode() method HashCode is designed to improve performance. The difference between the equals() method and the hashCode() method is:
3. Hierarchy of Java exception classes The red parts in the figure are checked exceptions. They must be caught or declared as thrown in the function. 4. Hierarchy of collection classes Note the difference between Collections and Collection. (Collections contain various static polymorphic methods related to collection operations) #p# 5. Java synchronization Java synchronization mechanism can be explained by the analogy of a building. 6. Aliases Aliases mean that there are multiple variables pointing to the same memory block that can be updated, and these aliases are different object types. 7. Heap and Stack The diagram shows where methods and objects are located in memory at runtime. 8. Java virtual machine runtime data area The diagram shows the entire virtual machine runtime data area. Original link: programcreek |
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