To remove a character at a specified position, use the following logic −Let’s say the following is our string.String str = "The Haunting of Hill House!";We want to remove a character at position 7. For that, use the below logic.// removing character at position 7 int pos = 7; String res = str.substring(0, pos) + str.substring(pos + 1);The following is the complete example with output.Example Live Demopublic class Demo {     public static void main(String[] args) {        String str = "The Haunting of Hill House!";        System.out.println("String: "+str);        // removing character at position 7        int pos = 7;        String res = str.substring(0,  pos) + str.substring(pos + 1); ... Read More

Use the Trim() method to remove leading and trailing whitespace from a string. Let’s say the following is our string with white spaces in the beginning and the end.String str = " a ";Now, use the trim() method.str.trim()The following is the final example with output.Example Live Demopublic class Demo {    public static void main(String[] args) {       String str = " a ";       System.out.println("Text = "+str);       System.out.println("Text after using trim() method = " + str.trim());     } }OutputText = a Text after using trim() method = a

Use the + Integer.toHexString() method in Java to convert integer to hexadecimal.Let’s say the following is our integer.int val = 768;Let us convert it to a hexadecimal value.Integer.toHexString(val)The following is the final example with the output.Example Live Demopublic class Demo {     public static void main(String[] args) {        int val = 768;        // integer        System.out.println("Integer: "+val);        // hex        System.out.println("Hex String = " + Integer.toHexString(val));     } }OutputInteger: 768 Hex String = 300

To convert integer to octal in Java, use the Integer.toOctalString() method.Let’s say the following is our integer.int val = 768;Convert the above integer to octal.Integer.toOctalString(val)The following is the final example.Example Live Demopublic class Demo {     public static void main(String[] args) {        int val = 768;        // integer        System.out.println("Integer: "+val);        // octal        System.out.println("Octal String = " + Integer.toOctalString(val));     } }OutputInteger: 768 Octal String = 1400

To convert an integer to binary, use the Integer.toBinaryString() method in Java.Let’s say the following is the integer we want to convert.int val = 999;Converting the above integer to binary.Integer.toBinaryString(val)Example Live Demopublic class Demo {     public static void main(String[] args) {        int val = 999;        // integer        System.out.println("Integer: "+val);        // binary        System.out.println("Binary = " + Integer.toBinaryString(val));     } }OutputInteger: 999 Binary = 1111100111

The java.text.NumberFormat class is used for formatting numbers and currencies as per a specific Locale. Number formats varies from country to countryTo format a number as percentage you need a percentage NumberFormat instance. To achieved this, use the getPercentageInstance() method.Example Live Demoimport java.text.NumberFormat; import java.util.Locale; public class MainClass {    public static void main(String[] args) {        // Currency of France is Euro        NumberFormat n = NumberFormat.getPercentInstance(Locale.FRANCE);        // points        double points = 1.78;        double totalPoints = points * 1000;        System.out.println(n.format(points));        System.out.println(n.format(totalPoints));     } }Output178 % 178 000 %

The getCurrencyInstance() method of the NumberFormat class returns the instance of the NumberFormat class. The java.text.NumberFormat class is used for formatting numbers and currencies as per a specific Locale. Number formats varies from country to countryHere, we have considered a locale.NumberFormat n = NumberFormat.getCurrencyInstance(Locale.FRANCE);Then, we have formatted a double value with the currency.double points = 1.78; System.out.println(n.format(points));The following is the final example.Example Live Demoimport java.text.NumberFormat; import java.util.Locale; public class MainClass {     public static void main(String[] args) {        // Currency of France is Euro        NumberFormat n = NumberFormat.getCurrencyInstance(Locale.FRANCE);        // points        double points = 1.78;        double totalPoints = points * 1000;        System.out.println(n.format(points));     ... Read More

The java.text.NumberFormat class is used for formatting numbers and currencies as per a specific Locale. Number formats varies from country to country.To get the instance of the NumberFormat class, call getInstance() method in Java.First, we will use the getInstance() method.NumberFormat n = NumberFormat.getInstance();Now, we will format a double.double val = 1.9898798; String formattedVal = n.format(val);The following is the final example.Example Live Demoimport java.text.NumberFormat; public class Demo {     public static void main(String args[]) {        NumberFormat n = NumberFormat.getInstance();        double val = 1.9898798;        System.out.println("Value: "+val);        String formattedVal = n.format(val);        System.out.println("Formatted Value: "+formattedVal);     } }OutputValue: 1.9898798 Formatted Value: 1.99Read More

Use the Short.parseShort() method in Java to convert a String to a short.Let’s say the following is our string.String str = “76”;Now, the parseShort() method will convert the string to short.byte val = Byte.parseByte(str);Example Live Demopublic class Demo {     public static void main(String[] args) {        String str = "76";        short val = Short.parseShort(str);        System.out.println(val);     } }Output76

To add leading zeros to a number, you need to format the output. Let’s say we need to add 4 leading zeros to the following number with 3 digits.int val = 290;For adding 4 leading zeros above, we will use %07d i.e. 4+3 = 7. Here, 3, as shown above, is the number with 3 digits.String.format("%07d", val);The following is the final example.Example Live Demoimport java.util.Formatter; public class Demo {     public static void main(String args[]) {        int val = 290;        System.out.println("Integer: "+val);        String formattedStr = String.format("%07d", val);        System.out.println("With leading zeros = " + formattedStr);     } }OutputInteger: 290 With leading zeros = 0000290