/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String str = "{\"AAA\":xxxxx,\"BB\":xxxx,\"CCC\":\"3 xxx\"}";
		str = str.substring(1, str.length() - 1);     // removing the {}
		String[] entries = str.split(",");            // get all the "key":value
		for (String entry: entries) {
		   String[] entryData = entry.split(":");     // get the key and the value
		   String key = entryData[0];
		   key = key.substring(1, key.length() - 1);  // removing the "" from key
		   String value = entryData[1];
		   System.out.println(key + " -> " + value);
		}
	}
}

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{"AAA":xxxxx,"BB":xxxx,"CCC":"3 xxx"}