Top 8 Diagrams for Understanding Java(quote)

最新推荐文章于 2025-11-25 12:11:25 发布

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本文精选了从ProgramCreek获取的8张Java学习理解图，覆盖了字符串不变性、equals()与hashCode()合约、异常类层次结构、集合类层次结构、Java同步机制、别名、堆栈与堆内存、JVM运行时数据区域等关键概念。

Top 8 Diagrams for Understanding Java

A diagram is sometimes worth 1000 words. The following diagrams are from Java tutorials on Program Creek, they have received the most votes so far. Hopefully, they can help you review what you already know. If the problem is not clear by the diagram itself, you may want to go to each article to take a further took.

1. String Immutability

The following diagram shows what happens for the following code:

String s = "abcd";
s = s.concat("ef");

string-immutability

2. The equals() and hashCode() Contract

HashCode is designed to improve performance. The contract between equals() and hasCode() is that:
1. If two objects are equal, then they must have the same hash code.
2. If two objects have the same hashcode, they may or may not be equal.

java-hashcode