Optimization methods in Java language

The Java language has become one of the most popular programming languages ​​today due to its cross-platform nature and superior performance. When applying Java language for programming development, we often need to consider how to optimize the code to improve its execution efficiency, reduce memory usage and other performance indicators, so that the code can better meet business needs. The following will introduce some commonly used optimization methods in the Java language.

1. Write efficient code

Writing efficient code is one of the most basic tasks for Java programmers. Efficient code should have appropriate data structures and algorithms to minimize the number of operations and guarantee time complexity. In addition, avoiding the use of a large number of loops, recursions and complex conditional judgments is also an important aspect of optimizing code.

2. Use memory to cache data

In the Java language, memory is a very precious resource. When we need to read data from the database or other external resources, in order to avoid frequent IO operations, we can cache the data in memory. In this way, every time data needs to be accessed, it can be read directly from memory without having to re-read it from external resources, thus improving performance.

3. Avoid using the string concatenation operator

In the Java language, the string concatenation operator will generate a new string object. When we use it to perform string When splicing, string objects will be created frequently, resulting in increased memory consumption and reduced performance. For this reason, we should try to avoid using this operator and instead use the StringBuilder class or StringBuffer class for string splicing, which can reduce object creation and improve performance.

4. Use thread pool to optimize concurrent operations

In multi-threaded programming, thread pool is an effective way to optimize concurrent operations. It can reduce the thread creation and destruction process, thereby saving system overhead and improving program response speed. Therefore, in the Java language, using thread pools to develop multi-threaded programs has become an optimization method.

5. It is forbidden to use automatic boxing and unboxing operations

In Java language, automatic boxing and unboxing operations are to convert basic type data into packaging classes or to The process of converting wrapper classes into basic type data. Although the process is simple, using autoboxing and unboxing operations in a loop can have a negative impact on performance. Therefore, to improve the performance of our code, we should avoid using this operation.

6. Using Local Variable Type Inference

JDK 10 introduces a new language feature-local variable type inference (Local Variable Type Inference, referred to as Var), which Allows programmers to declare local variables more concisely and clearly. Using Var can simplify the code, thereby reducing the complexity and redundancy of the code, and improving the readability and maintainability of the code.

7. Avoid repeated calls to methods

In the Java language, when the return value of a method will not change, we should try to avoid calling this method repeatedly. Because every time a method is called, the return value of the method needs to be recalculated, thus reducing the running efficiency of the program. "Will not change" here means that the return value of the method will not change if the parameters of the method and the calling environment do not change.

Summary

The above are the commonly used performance optimization methods in the Java language, but of course this is not all. The running environment of the Java language is very complex, and different application scenarios have their own optimization solutions and techniques. Programmers need to reasonably choose optimization methods and perform targeted code optimization based on project needs and actual conditions to maintain the high performance of our applications.

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