java 如何在java中获取主类名
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How to get the main class name in java
提问by Karthikeyan
How to get the main class name in any point of my java execution. all that i wanted is i need to get the class name from where my execution has started. Example,
如何在我的 java 执行的任何一点获取主类名。我想要的只是我需要从我的执行开始的地方获取类名。例子，
package mypackage;
class A
{
public static sayName()
{
System.out.println("Here i have to print the class name B");
}
}
package test;
import mypackage.A;
class B
{
public static void main()
{
A.sayName();
}
}
Thanks in advance
提前致谢
回答by Vallabh Patade
See if this works.
看看这是否有效。
StackTraceElement[] stack = Thread.currentThread ().getStackTrace ();
StackTraceElement main = stack[stack.length - 1];
String mainClass = main.getClassName ();
But I am not sure if it will work if execution of this code has another thread of control other than main thread.
但是我不确定如果此代码的执行具有除主线程之外的另一个控制线程，它是否会起作用。
回答by harikrishnan.n0077
Try this
试试这个
public static String getMainClassName()
{
for(final Map.Entry<String, String> entry : System.getenv().entrySet())
{
if(entry.getKey().startsWith("JAVA_MAIN_CLASS"))
return entry.getValue();
}
throw new IllegalStateException("Cannot determine main class.")
}
This might work but it's not portable between JVMs.
这可能有效，但它不能在 JVM 之间移植。
回答by Timofei
I'll create additional holder class which will hold main class name. Something like that:
我将创建额外的持有者类，该类将保存主类名称。类似的东西：
public class MainClassHolder{
private static String className = null;
public static void setClassName(String name) {
className = name;
}
public static String getClassName() {
return className;
}
}
Then in main methot you'll set up className into holder
然后在主方法中，您将把 className 设置为 holder
package mypackage;
class A
{
public static sayName()
{
System.out.println(MainClassHolder.getClassName());
}
}
package test;
import mypackage.A;
class B
{
public static void main()
{
MainClassHolder.setClassName(B.class.getName());
A.sayName();
}
}
