public String getProperty(String key)
public String getProperty(String key, String defaultValue)

If the key is not found and no default value is provided, null is returned.

import java.io.FileInputStream;
import java.util.Properties;
/*w w w  . ja v a2s  . c  o m*/
public class Load {
  public static void main (String args[]) throws Exception {
    Properties p = new Properties();
    p.load(new FileInputStream("colon.txt"));
    p.getProperty("foo");
  }
}

運行結(jié)果如下:

foo:bar
one
two
three=four
five  six seven eight
nine ten