获取当前正在 Java 中执行的方法名称
原文:https://www . geeksforgeeks . org/get-name-of-current-method-in-Java-executed/
获取当前执行方法的名称对于处理异常和调试非常有用。 下面是获取当前执行方法的不同方法:
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Using Throwable Stack Trace :
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Using Throwable Class : In Java, Throwable class is the superclass of all exceptions and errors in java.lang package. Java Throwable class provides several methods like addSuppressed(), getMessage(), getStackTrace(), getSuppressed(), toString(), printStackTrace() etc. We can get an array of stack trace elements representing the stack trace pertaining to throwable by calling getStackTrace() on a Throwable instance. At 0th index element of the array represents the top of the stack, which is the latest method call in the sequence.
```java // Java program to demonstrate // Getting name of current method // using Throwable Class public class GFG {
public static void foo() { // getStackTrace() method return // current method name at 0th index String nameofCurrMethod = new Throwable() .getStackTrace()[0] .getMethodName();
System.out.println("Name of current method: " + nameofCurrMethod); }
public static void main(String[] args) { // call function foo(); } } ```
输出:
java Name of current method: foo -
使用异常类 我们还可以使用扩展可投掷类的异常类。
```java // Java program to demonstrate // Getting name of current method // using Throwable Class
public class GFG {
public static void foo() { // getStackTrace() method return current // method name at 0th index String nameofCurrMethod = new Exception() .getStackTrace()[0] .getMethodName();
System.out.println("Name of current method: " + nameofCurrMethod); }
public static void main(String[] args) { // call function foo(); } } ```
输出:
java Name of current method: foo -
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使用 getEnclosingMethod()方法T3】
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By Object Class : We can use Class.getEnclosingMethod(), this method returns a Method object representing the instantly enclosing method of the prime class. But this come with a expressive overhead as it involves creating a new anonymous inner class behind the scenes.
```java // Java program to demonstrate // Getting name of current method // using Object Class public class GFG {
// create a static method foo public static void foo() { // this method return a Method object representing // the instantly enclosing method of the method class String nameofCurrMethod = new Object() {} .getClass() .getEnclosingMethod() .getName();
System.out.println("Name of current method: " + nameofCurrMethod); }
public static void main(String[] args) { // call function foo(); } } ```
输出:
java Name of current method: foo -
By Inner Class : We can also define a inner class within a method to get Class reference.
```java // Java program to demonstrate // Getting name of current method // using Inner Class
public class GFG {
// create a static method foo public static void foo() { // Local inner class class Inner { };
// this method return a Method object representing // the instantly enclosing method of the method class String nameofCurrMethod = Inner.class .getEnclosingMethod() .getName();
System.out.println("Name of current method: " + nameofCurrMethod); }
public static void main(String[] args) { // call function foo(); } } ```
输出:
```java Name of current method: foo //This java program on our machine because inner class // have some restriction for security purpose
```
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Using Thread Stack Trace : The Thread.getStackTrace() method returns array of stack trace elements. The second element of the returned array of stack trace contains name of method of current thread.
```java // Java program to demonstrate // Getting name of current method // using Thread.getStackTrace() public class GFG {
// create a static method foo public static void foo() { // Thread.currentThread() return current method name // at 1st index in Stack Trace String nameofCurrMethod = Thread.currentThread() .getStackTrace()[1] .getMethodName();
System.out.println("Name of current method: " + nameofCurrMethod); }
public static void main(String[] args) { // call function foo(); } } ```
输出:
java Name of current method: foo
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