Java中的 Logger isLoggable() 方法及示例

Logger类的isLoggable()方法用于返回布尔值的响应，该响应提供了对查询的答案，即给定级别的消息是否实际由该记录器记录。此检查基于 Loggers 有效级别，该级别可能继承自其父级。

句法：

public boolean isLoggable(Level level)

参数：此方法接受一个参数级别，表示消息记录级别。

返回值：如果当前正在记录给定的消息级别，则此方法返回 true。

下面的程序说明了 isLoggable() 方法：

方案一：

// Java program to demonstrate
// Logger.isLoggable() method
  
import java.util.logging.*;
  
public class GFG {
  
    private static Logger logger
        = Logger.getLogger(
            GFG.class.getName());
  
    public static void main(String args[])
    {
  
        // Check if the Level.INFO
        // is currently being logged.
        boolean flag
            = logger.isLoggable(
                Level.INFO);
  
        // Print value
        System.out.println("The Level.INFO"
                           + " is currently being logged - "
                           + flag);
    }
}

输出：

The Level.INFO is currently being logged - true

方案二：

// Java program to demonstrate
// Logger.isLoggable() method
  
import java.util.logging.*;
  
public class GFG {
  
    private static Logger logger
        = Logger.getLogger(
            GFG.class.getName());
  
    public static void main(String args[])
    {
  
        // Check if the Level.OFF
        // is currently being logged.
        boolean flag
            = logger.isLoggable(Level.OFF);
  
        // Print value
        System.out.println("The Level.OFF"
                           + " is currently being logged - "
                           + flag);
    }
}

输出：

The Level.OFF is currently being logged - true

参考： https: Java Java.util.logging.Level)