String in Java with example

String in Java with example

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Strings are a sequence of characters, but in Java, Strings are objects. A Java string is a sequence of characters that exist as an object of the class java.lang.String.

Strings, which are widely used in Java programming, are a sequence of characters. In the Java programming language, strings are objects.

String Example: Below example has most types of string creation methods:

package csc;
public class csc_string1 {
public static void main(String args[]) {
String s1 = "chandan";
String s2 = "chandan";
String s3 = new String("chandan");
String s4 = new String("chandan");
String s5 = new String(s1);
char arr[] = {'h','e','l','1','0','w', 'o','r', 'l', 'd'};
String s6 = new String(arr);
String s7 = new String(arr, 0, 4);
System.out.println(s1==s2);
System.out.println(s3==s4);
System.out.println(s5);
System.out.println(s6);
System.out.println(s7);
int x = s3.length();
System.out.println(x);
}
}

Output :
true
false
chandan
hel10world
hel1
7

String In Java : String is a sequence of characters & in java, string is an object that represents a sequence of characters. Or STRING is a character array.

Now the question comes: why is a Java string immutable?
Answer : Immutable means unmodified or unchangeable. Better understood by example:

public class chandan {
public static void main(String args[]) {
String a = "chandan";
a.concat("singh"); // concat() method appends the string at the end
System.out.println(a);
}
}

Output : chandan

How to create a string object?
There are two ways to create a String object:
1) By string literal: String a = "welcome at iamchandan.com";
2) By new keyword: String a = new String("welcome at iamchandan.com");

String Builder and String Buffer in JAVA

public class ConsTest {
public static void main(String args[]) {
String str = String.join("--", "Chandan", "Singh");
System.out.println(str);
StringBuffer sbf = new StringBuffer("way2testing");
sbf.append(".com");
System.out.println(sbf);
StringBuilder sbd = new StringBuilder("Software testing");
sbd.append("way2testing");
System.out.println(sbd);
}
}

Difference between String builder and string buffer

StringBuffer	StringBuilder
String buffer is synchronized i.e. thread safe.	StringBuilder is non-synchronized i.e. not thread safe.
Less efficient than string builder.	More efficient than stringbuffer.