Java split(".") 和 split("\\.")

Java split(".") 和 split("\\.")

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Problem Description

Use . Decomposition of the respective segments IP, and print, such as: 192.168.10.123, decomposition 19216810123

Process using the following procedure:

/**
 * Created by Miracle Luna on 2019/11/10
 */
public class SplitIP {
    public static void main(String[] args) {
        String ip = "192.168.10.123";
        String[] ipArr = ip.split(".");
        System.out.println("ipArr.length: " + ipArr.length );
        for (String ipVar : ipArr) {
            System.out.println(ipVar);
        }
    }
}

 

Execution results are as follows ( not in accordance with the expected IP decomposed ):

 

problem causes

. Special characters , you need to use the escape character escaped .

 

Problem

Code changes as follows:

/**
 * Created by Miracle Luna on 2019/11/10
 */
public class SplitIP {
    public static void main(String[] args) {
        String ip = "192.168.10.123";
        String[] ipArr = ip.split("\\.");
        System.out.println("ipArr.length: " + ipArr.length );
        for (String ipVar : ipArr) {
            System.out.println(ipVar);
        }
    }
}

 

Results of the following ( to achieve the desired effect decomposition ):