Use replace() method to replace all occurrences of a given character in a string.Here is our string.String str = "THIS IS DEMO LINE $$$ NEW LINE";Let us now replace all occurrences of character $ with *str.replace("$", "*")The following is the complete example that replace all occurrences of $ with *Example Live Demopublic class Demo {     public static void main(String[] args) {        String str = "THIS IS DEMO LINE $$$ NEW LINE";        System.out.println("String = "+str);        System.out.println("Replacing all occurrence of given character...");        System.out.println("Updated string = "+str.replace("$",  "*"));     } }OutputString = THIS IS DEMO LINE $$$ NEW LINE Replacing ... Read More

User replaceAll() method to replace all occurrences of a given string. Let’s say the following is our string.String str = "THIS IS DEMO LINE AND NEW LINE!";Here, we are replacing all occurrences of string “LINE” to “TEXT”str.replaceAll("LINE", "TEXT");The following is the final example.Example Live Demopublic class Demo {    public static void main(String[] args) {       String str = "THIS IS DEMO LINE AND NEW LINE!";       Sytem.out.println("String = "+str);       System.out.println("Replacing all occurrence of string LINE...");       System.out.println("Updated string = "+str.replaceAll("LINE",  "TEXT"));     } }OutputString = THIS IS DEMO LINE AND NEW LINE! Replacing all occurrence of string LINE... Updated string = ... Read More

To check the end of a string, use the endsWith() method.Let’s say the following is our string.String str = "demo";Now, check for the substring “mo” using the endsWith() method in an if-else condition.if(str.endsWith("mo")) {    System.out.println("The string ends with the word mo"); } else {    System.out.println("The string does not end with the word mo"); }The following is the complete example with output.Example Live Demopublic class Demo {     public static void main(String[] args) {        String str = "demo";        if(str.endsWith("mo")) {           System.out.println("The string ends with the word mo");        } else {           System.out.println("The string does not ... Read More

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