threadgroup_Java ThreadGroup toString（）方法与示例

threadgroup

ThreadGroup类的toString()方法 (ThreadGroup Class toString() method)

toString() method is available in java.lang package.
toString()方法在java.lang包中可用。
toString() method is used to returns string denotation of this thread group (i.e. this method returns how to represent a string of this ThreadGroup).
toString()方法用于返回该线程组的字符串符号(即，该方法返回如何表示此ThreadGroup的字符串)。
toString() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
toString()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
toString() method may throw an exception at the time of string denotation of this ThreadGroup.
在此ThreadGroup的字符串表示形式时， toString()方法可能会引发异常。

SecurityException – This exception may throw when the current thread is not permitted to update this Thread group.
SecurityException-当不允许当前线程更新此Thread组时，可能引发此异常。

Syntax:

句法：

    public String toString();

Parameter(s):

参数：

It does not accept any parameter.
它不接受任何参数。

Return value:

返回值：

The return type of this method is String – it denotes string of this thread group.

该方法的返回类型为String –表示该线程组的字符串。

Example:

例：

// Java program to demonstrate the example 
// of String toString() method of ThreadGroup 
public class toString {
public static void main(String[] args) {
ThreadGroup th_grp1 = new ThreadGroup("th_grp - 1");
ThreadGroup th_grp2 = new ThreadGroup("th_grp - 2");
// By using getName() method is to display
// thread group name
System.out.println("th_grp1.getName(): " + th_grp1.getName());
System.out.println("th_grp2.getName(): " + th_grp2.getName());
// By using toString() method is to string
// representation of thread group 
System.out.println("th_grp1.toString(): " + th_grp1.toString());
System.out.println("th_grp2.toString(): " + th_grp2.toString());
}
}

Output

输出量

th_grp1.getName(): th_grp - 1
th_grp2.getName(): th_grp - 2
th_grp1.toString(): java.lang.ThreadGroup[name=th_grp - 1,maxpri=10]
th_grp2.toString(): java.lang.ThreadGroup[name=th_grp - 2,maxpri=10]