Java - String String Basics

What is a String?

A sequence of zero or more characters is known as a string.

Java string is represented by an object of the java.lang.String class.

String class is immutable. The contents of a String object cannot be modified after it has been created.

StringBuilder and StringBuffer

The String class has two companion classes, java.lang.StringBuilder and java.lang.StringBuffer.

The companion classes are mutable.

For example, to accumulate a string value to create a longer string value, you should use StringBuilder or StringBuffer;

The following code creates a String object and output its value

Demo

public class Main {
  public static void main(String[] args) {
    String s = "book2s.com";
    System.out.println(s);/* ww w  .  java 2s. c  om*/
  }
}

Result

Exercise

• Write code to Fill String by repeating char for certain times
• Write code to Repeat a string n times to form a new string.
• Write code to Check if a string is correctly set.
• Write code to convert long value to readable String in KB MB GB ...
• Write code to convert milli seconds To String
• Write code to Return a string concatenation of "\n" based on the numberOfNewLines
• Write code to Return a string concatenation of "\t" based on the numberOfTabs
• Write code to get string Size in GBK encoding
• Write code to convert String encoding to hold Chinese
• Write code to check if a string is Numeric using BigDecimal
• Write code to Test to see if the given string ends with any of the given terms.

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