UUID generation in Java

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How to use java's UUID class to generate a 32-bit UUID ???

Solve the problem

The following are 2 UUID generation methods. In the real project, I used the first method:

[code]import java.util.UUID;

/**
 * Created by Ay on 2016/4/18.
 */
public class JavaUUIDTest {

    public static void main(String[] args) {

        //未加工的UUID
        String preUuid = UUID.randomUUID().toString();
        System.out.println(preUuid);

        //第一种方法生成UUID，去掉“-”符号
        System.out.println(UUID.randomUUID().toString().replace("-", ""));

        //未加工的UUID
        String preUuid2 = UUID.randomUUID().toString();
        System.out.println(preUuid2);
        //第二种生成UUID的方法，去掉“-”符号
        String changUuid = preUuid2.substring(0,8)+preUuid2.substring(9,13)+preUuid2.
        substring(14,18)+preUuid2.substring(19,23)+preUuid2.substring(24);

        System.out.println(changUuid);
    }
}

Result:

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