Replaces indexOf for contains for greater readability

Signed-off-by: Otavio R. Piske <angusyoung@gmail.com>

Author: orpiske

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/logging/JSR47Logger.java

@@ -190,7 +190,7 @@ private void logToJsr47(java.util.logging.Level julLevel, String sourceClass, St
 			ResourceBundle messageCatalog, String msg, Object[] inserts, Throwable thrown) {
 //		LogRecord logRecord = new LogRecord(julLevel, msg);
 		String formattedWithArgs = msg;
-		if (msg.indexOf("=====")== -1) {
+		if (!msg.contains("=====")) {
 			formattedWithArgs = MessageFormat.format(getResourceMessage(messageCatalog, msg), inserts);
 		}
 		LogRecord logRecord = new LogRecord(julLevel, resourceName + ": " +formattedWithArgs);

org.eclipse.paho.mqttv5.client/src/main/java/org/eclipse/paho/mqttv5/client/logging/JSR47Logger.java

@@ -190,7 +190,7 @@ private void logToJsr47(java.util.logging.Level julLevel, String sourceClass, St
 			ResourceBundle messageCatalog, String msg, Object[] inserts, Throwable thrown) {
 //		LogRecord logRecord = new LogRecord(julLevel, msg);
 		String formattedWithArgs = msg;
-		if (msg.indexOf("=====")== -1) {
+		if (!msg.contains("=====")) {
 			formattedWithArgs = MessageFormat.format(getResourceMessage(messageCatalog, msg), inserts);
 		}
 		LogRecord logRecord = new LogRecord(julLevel, resourceName + ": " +formattedWithArgs);

org.eclipse.paho.sample.utility/src/main/java/org/eclipse/paho/sample/utility/MQTTFrame.java

@@ -475,12 +475,12 @@ public void run() {
 			// If the entry in the IP Address drop down list contains '://' then assume
 			// the connection has been explicitly entered as tcp://ip_address:port or local://broker_name.
 			// Otherwise read the ip address and port number from their respective drop downs.
-			if ( ipAddr.indexOf("://") < 0 ) {
+			if (!ipAddr.contains("://")) {
     			connStr = "tcp://" + ipAddr + ":" + portNum;
    	 		} else {
    	 			connStr = ipAddr;
    	 		}
-	
+
     		connect( connStr, optionsComp.isPersistenceSelected() );
 
 			// Successful connect(no exception). Remember the ipAddress and port in the drop downs