In order to check if a String has only unicode digits in Java, we use the isDigit() method and charAt() method with decision making statements.The isDigit(int codePoint) method determines whether the specific character (Unicode codePoint) is a digit. It returns a boolean value, either true or false.Declaration − The java.lang.Character.isDigit() method is declared as follows −public static boolean isDigit(int codePoint)where the parameter codePoint represents the character to be checked.The charAt() method returns a character value at a given index. It belongs to the String class in Java. The index must be between 0 to length()-1.Declaration − The java.lang.String.charAt() method is ... Read More

In order to check if a String has only unicode digits or space in Java, we use the isDigit() method and the charAt() method with decision making statements.The isDigit(int codePoint) method determines whether the specific character (Unicode codePoint) is a digit. It returns a boolean value, either true or false.Declaration - The java.lang.Character.isDigit() method is declared as follows −public static boolean isDigit(int codePoint)The charAt() method returns a character value at a given index. It belongs to the String class in Java. The index must be between 0 to length()-1.Declaration − The java.lang.String.charAt() method is declared as follows −public char charAt(int ... Read More

Before converting a String to UTF-8-bytes, let us have a look at UTF-8.UTF-8 is a variable width character encoding. UTF-8 has ability to be as condense as ASCII but can also contain any unicode characters with some increase in the size of the file. UTF stands for Unicode Transformation Format. The '8' signifies that it allocates 8-bit blocks to denote a character. The number of blocks needed to represent a character varies from 1 to 4.In order to convert a String into UTF-8, we use the getBytes() method in Java. The getBytes() method encodes a String into a sequence of ... Read More

Before moving onto their conversions, let us learn about Unicode and UTF-8.Unicode is an international standard of character encoding which has the capability of representing a majority of written languages all over the globe. Unicode uses hexadecimal to represent a character. Unicode is a 16-bit character encoding system. The lowest value is \u0000 and the highest value is \uFFFF.UTF-8 is a variable width character encoding. UTF-8 has the ability to be as condense as ASCII but can also contain any unicode characters with some increase in the size of the file. UTF stands for Unicode Transformation Format. The '8' signifies ... Read More

Before moving onto their conversions, let us learn about Unicode and UTF-8.Unicode is an international standard of character encoding which has the capability of representing a majority of written languages all over the globe. Unicode uses hexadecimal to represent a character. Unicode is a 16-bit character encoding system. The lowest value is \u0000 and the highest value is \uFFFF.UTF-8 is a variable width character encoding. UTF-8 has the ability to be as condensed as ASCII but can also contain any Unicode characters with some increase in the size of the file. UTF stands for Unicode Transformation Format. The '8' signifies ... Read More

In order to reverse the sequence of characters in a StringBuffer Object, we use the reverse() method. The reverse() method replaces the character sequence with the reverse of its own.Declaration − The java.lang.StringBuffer.reverse method is declared as follows−public StringBuffer reverse()Let us see a program to reverse the sequence of characters in a StringBuffer Object using the reverse() method.Example Live Demopublic class Example {    public static void main(String[] args) {       StringBuffer sb = new StringBuffer("Hello World");       System.out.println("Original StringBuffer Object: " + sb);       sb.reverse();       System.out.println("New StringBuffer Object: " +sb);   ... Read More

In order to remove a substring from a Java StringBuilder Object, we use the delete() method. The delete() method removes characters in a range from the sequence. The delete() method has two parameters, start, and end. Characters are removed from start to end-1 index.Declaration − The java.lang.StringBuilder.delete() method is declared as follows −public StringBuilder delete(int start, int end)Let us see an example which removes a substring from a StringBuilder.Example Live Demopublic class Example {    public static void main(String[] args) {       StringBuilder sb = new StringBuilder("Welcome to Java Programming");       System.out.println("Original StringBuilder Object: " + sb.toString()); ... Read More

In order to remove characters in a specific range from a Java StringBuffer Object, we use the delete() method. The delete() method removes characters in a range from the sequence. The delete() method has two parameters , start and end. Characters are removed from start to end-1 index.Declaration − The java.lang.StringBuffer.delete() method is declared as follows −Let us see a program to delete characters in a specific range from a Java StringBuffer Object.Example Live Demopublic class Example {    public static void main(String[] args) {       StringBuffer sb = new StringBuffer("Hello World");       System.out.println("Original StringBuffer Object: " ... Read More

In order to remove a character from a Java StringBuffer object, we use the deleteCharAt() method. The deleteCharAt() removes the character at the specified index. The length of resultant sequence of characters of the StringBuffer object is reduced by one.Declaration − The java.lang.StringBuffer.deleteCharAt() method is declared as follows−public StringBuffer deleteCharAt(int index)Let us see a program to illustrate the use of the deleteCharAt()Example Live Demopublic class Example {    public static void main(String[] args) {       StringBuffer sb = new StringBuffer("Hello World");       sb.deleteCharAt(7);       System.out.println(sb);    } }OutputHello Wrld

To get the arc sine of a given value in Java, we use the java.lang.Math.asin() method. The asin() method accepts a double value whose angle needs to be computed. The range of the angle returned lies in the range -pi/2 to pi/2. If the argument is NaN, then the result is NaN.When the argument is zero, then the output is a zero with the same sign as the argument.Declaration − The java.lang.Math.asin() method is declared as follows−public static double asin(double a)where a is the value whose arc sine is computed.Let us see a program to get the arc sine of ... Read More