Problem:
How to list Java Properties? Properties can be written to PrintWriter or PrintStream as we demonstrate in the example below.
Solution:
java.util.Properties has two list() methods that write to different targets:
- void list(PrintStream out)
Prints all properties to given output stream. - void list(PrintWriter out)
Prints all properties to given writer.
In the following example we create a new Properties object and fill with two properties. Then we print them using list(PrintStream) and passing System.out as our target:
package com.farenda.java.util;
import java.util.Properties;
public class PropertiesList {
public static void main(String[] args) {
Properties props = new Properties();
props.setProperty("connectionTime", "1200");
props.setProperty("maxThreads", "50");
props.list(System.out);
}
}
As you can see, when defining property, both key and value are of String type.
Running the code produces the following output:
-- listing properties -- connectionTime=1200 maxThreads=50
