"如何读取控制台输出的最后一行？"

Question

So im trying to make a Java program that uses adb and fastboot to root my Nexus 6P. I have a class that can run the commands, but I need to capture the device ID from the output. when I run adb<\/code> or fastboot<\/code> the output either looks like one of the three options below

List of devices attached
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
5VT7N16324000434          device

Answer 1

I'm not sure but the only solution that come's up to my mind, is to route the PrintStream<\/code> ( System.out<\/code> ) and assign every line that gets printed to a String called lastLine<\/code> or something. You can then get the device ID using a regex expression that removes the spaces\/tabs after the actual device ID
like this -> ( DEVICEID device<\/code> ) to ( DEVICEID<\/code> ) or just replace every space using String.replaceAll(" ", "");<\/code>and the "device" word using String.replace("device", "");<\/code> . I hope I could help you, as I'm fairly new to this community.

private String lastLine;

public void construct() {
    System.setOut(new PrintStream(System.out) {
        public void println(String s) {
            lastLine = s;
            super.println(s);
        }
    });
}