When a developer breaks the rules of the Java programming language, an error appears. It could result from a programmer's typing errors while developing a program. It may generate incorrect output or cause the program to terminate abnormally.
假设你在Java中编写了一段代码，想要运行或编译它，突然你遇到了Java代码中的错误。然后你开始担心该怎么办？结果是，每当出现错误时，程序都会终止，因为它无法捕捉错误。
Why wait for this process to find an error in your code? You get the perfect result for your Java program code if you have some ideas or knowledge to avoid errors before the program compiles or runs. If you can prevent errors before they occur, you will save time and have an easier time running and compiling code. The best way to correct errors is to avoid them.
Here are a few ways we describe for you that help you avoid Java errors.
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Ways to Avoid Java code Errors
在Java中，错误可以以三种方式发生：编译时错误、运行时错误和逻辑错误。
Runtime errors
Run Time errors occur or are detected during the execution of program code. These are occasionally detected when the programmer enters incorrect or irrelevant data. Runtime errors occur when a program contains no syntax errors but requests that the device do something that the device is not able to perform satisfactorily.
开发者或编译器在编译过程中无法识别这些错误的方法。而在程序运行时，Java虚拟机会检测到它。
我们可以将错误的编程代码放在try块中，并在catch块中捕获错误，以在运行时控制错误。
示例 - 例如，如果用户在设备需要整数时以字符串格式输入数据，则会发生运行时错误。
Compile time error
编译时错误是指由于错误的语法，包括缺少括号或在语句末尾缺少分号等等，导致Java代码无法运行的错误。在编译过程中，当Java编译器检测到这些错误时，屏幕上会显示错误代码。有时，语法错误也用于指代编译时错误。
As a result of the java compiler identifying the errors for you, these errors are simple to spot and correct. The compiler will identify your program's troublesome code and its working assumption of what went wrong. However, if the issue is with improperly tree-structured braces, the actual error could be at the start of the block.
通常，编译器会指示代码错误的确切语句，或者偶尔是它之前的一行。实质上，编程代码的语法错误表示为语法错误。
Example − 拼写错误的进程或变量名称。
Logical error
当您的Java代码程序构建和运行时，但是它执行了错误的操作，给出了错误的答案，或者在应该有输出时没有产生任何结果，这就是逻辑错误。编译器和JVM都无法检测到这些错误。因为Java系统无法理解您的程序应该做什么，所以它没有提供任何额外的细节来帮助检测错误。
Semantic errors are a different name for logical errors. These mistakes result from a programmer using the wrong idea or concept when coding. Syntax errors are grammar errors, whereas logical errors are caused by incorrect interpretation. For instance, if a developer unintentionally adds 2 variables when intending to subtract them, the program will run successfully and without error, but the result will be incorrect.
示例 - 在对变量进行操作时，使用'/'运算符而不是'%'无意中获得模数。
Winding Up
我们经常犯一些错误；当我们使用Java时，我们都会犯这些错误。一旦我们学会发现并修复这些常见的Java错误，我们就能避免再次犯错。
Java使得避免错误变得非常简单，这节省了时间并且使得代码运行更高效。在设备上创建或编写Java代码时，您可以防止错误的发生。要修复错误，您不需要等待冗长的过程。在Java中，避免在代码执行期间和之后出现错误的最佳方法是编译时和运行时错误检测。
