如何查看JDK默认编码格式

import java.io.ByteArrayOutputStream;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;

class Test {
  public static void main(String[] args) {
        System.out.println("Default Charset=" + Charset.defaultCharset());
        System.out.println("file.encoding=" + System.getProperty("file.encoding"));
        System.out.println("Default Charset=" + Charset.defaultCharset());
        System.out.println("Default Charset in Use=" + getDefaultCharSet());
    }

    private static String getDefaultCharSet() {
        OutputStreamWriter writer = new OutputStreamWriter(new ByteArrayOutputStream());
        String enc = writer.getEncoding();
        return enc;
    }

}