Simple Logger in android that allows var-arg style logging

Logger.java

import android.util.Log;

import static java.lang.String.format;

/**
 * @author Ajay Kumar.N.S
 * @since 1.0, 12/28/11, 11:52 PM
 */
public final class Logger {
    public final String tag;

    public static Logger forK(Class<?> klas){
        return new Logger(klas.getSimpleName());
    }

    public Logger(String tag) {
        this.tag = tag;
    }

    public void debug(String msg) {
        Log.d(tag, msg);
    }

    public void info(String msg) {
        Log.i(tag, msg);
    }

    public void warn(String msg) {
        Log.w(tag, msg);
    }

    public void wtf(String msg) {
        Log.e(tag, msg);
    }

    public void debug(String msg, Object... params) {
        Log.d(tag, format(msg, params));
    }

    public void info(String msg, Object... params) {
        Log.i(tag, format(msg, params));
    }

    public void warn(String msg, Object... params) {
        Log.w(tag, format(msg, params));
    }

    public void wtf(String msg, Object... params) {
        Log.e(tag, format(msg, params));
    }

    public void err(String msg, Throwable err){
        Log.e(tag, msg, err);
    }

    public void err(Throwable err){
        Log.e(tag, "error occurred", err);
    }

}