Summary of practical experience in Java language

The Java language is a high-level programming language launched by Sun in 1995. It has cross-platform characteristics, is easy to learn and use, and is widely used. It has become an important tool in the field of modern software development. However, the success of the Java language does not only rely on its design and functions, but also requires programmers to constantly summarize practical experience to improve program development efficiency and quality. This article will introduce some practical experiences in the Java language and explore how to apply these experiences in practice.

1. Practical experience in optimizing code

The execution efficiency of the Java language is affected by many factors, such as virtual machines, operating systems, hardware and other factors, so it is necessary to do everything possible during program development. Optimize code where possible to improve its execution efficiency. The following are some practical experiences in optimizing code in the Java language:

1. Use StringBuilder to replace String splicing:

String str = "";
for(int i = 0; i < 10; i ){

str += i;

}

Use StringBuilder:

StringBuilder sb = new StringBuilder();
for(int i = 0 ; i < 10; i ){

sb.append(i);

}
String str = sb.toString();

2. Use static constants to replace hard coding:

public static final int PAGE_SIZE = 10;
public static final int CACHE_SIZE = 100;

3. Use local variables as much as possible:

for(int i = 0; i < list.size(); i ){

Object obj = list.get(i); //创建新的局部变量
// ...

}

The above three practical experiences can bring significant improvement in execution efficiency in practice.

2. Practical experience in improving code readability

Readability is an important indicator of code quality. In the Java language, improving code readability helps reduce code maintenance costs and improve code collaboration. The following are some practical experiences in improving code readability in the Java language:

1. Use appropriate naming:

Naming should comply with specifications and be able to clearly express variables, The meaning of methods, etc., avoid using abbreviations and pinyin.

2. Code indentation and alignment:

Code indentation and alignment can make the code structure clearer and easier for readers to read and understand.

3. Add comments:

Adding comments can make the code easier to understand, and it can also facilitate code maintenance and modification.

The above three practical experiences can bring more readable code in practice.

3. Practical experience in avoiding common Java language traps

In the Java language, programmers can easily fall into some common traps, thereby reducing the efficiency and quality of the program. Here are some practical tips for avoiding common pitfalls in the Java language:

1. Avoid creating objects in loops:

Creating objects in loops increases the load on the JVM runtime , and it will also take up more memory space, so frequent creation of objects in the loop should be avoided.

2. Avoid excessive recursion:

Recursion can cause stack overflow and in some cases can cause serious degradation in program performance. Therefore, excessive recursion should be avoided in Java language.

3. Avoid using garbage collection:

Garbage collection will occupy more resources of the Java virtual machine, so you should avoid using garbage collection frequently in your program and use it as much as possible Static variables to avoid loop creation.

The above three practical experiences can avoid reducing the efficiency and quality of the program in practice.

Conclusion

Practical experience in the Java language is very important for programmers. Summarizing and applying these experiences in practice can improve code quality, execution efficiency and readability. Optimizing code, improving code readability and avoiding common Java language pitfalls are skills that Java programmers must master. Through practice and summary, we can continuously improve our code level and capabilities and create efficient and maintainable code.

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