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new String("test").equals("test") // --> true new String("test") == "test" // --> false new String("test") == new String("test") // --> false "test" == "test" // --> true "test" == "te" + "st" // --> true Objects.equals("test", new String("test")) // --> true Objects.equals(null, "test") // --> false Objects.equals(null, null) // --> true |
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public class StringReverseExample { public static void main(String[] args) { String string = "abcdef"; String reverse = new StringBuffer(string). reverse().toString(); System.out.println("\nString before reverse:"+string); System.out.println("String after reverse:"+reverse); } } |
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public class StringToLong { public static void main(String args[]) { String strLong = "2323232"; //Convert String to long using Long.valueOf(),better because //it can cache frequently used long values long number = Long.valueOf(strLong); System.out.println("String to long conversion using valueOf :" + number); //Convert String to long in Java using java.lang.Long object strLong = "4444444444444444444"; Long numberObject = new Long(strLong); number = numberObject; //auto boxing will take care of long to Long conversion System.out.println("String to long conversion example using Long object: " + number); //Convert String to long with Long.parseLong method in Java strLong = "999999999999999999"; Long parsedLong = Long.parseLong(strLong); number = parsedLong; //auto-boxing will convert Long object to primitive long System.out.println("String to long conversion using parseLong() method: " + number); //Convert String to long using Long.decode() method in Java strLong = "-1023454"; number = Long.decode(strLong); System.out.println("String to long conversion using decode() method: " + number); //String to long in hexadecimal format strLong = "0xFFFF"; number = Long.decode(strLong); System.out.println("String to long example in hex format decode() method: " + number); //String to long in octal format strLong = "0777"; number = Long.decode(strLong); System.out.println("String to long example in octal format decode() method: " + number); } } |
Output: