Java8 Programming Examples

Replace String with another in java

java8

import java.io.*;
public class Test {
   public static void main(String args[]) {
      String Str = new String("Welcome to Tutorialspoint.com");
      System.out.print("Return Value :" );
      System.out.println(Str.replace('o', 'T'));
      System.out.print("Return Value :" );
      System.out.println(Str.replace('l', 'D'));
   }
}

Convert a Java String to an Int

java8

public class Test {
   public static void main(String args[]) {
      int x =Integer.parseInt("9");
      double c = Double.parseDouble("5");
      int b = Integer.parseInt("444",16);
      System.out.println(x);
      System.out.println(c);
      System.out.println(b);
   }
}

Difference between charAt() and indexOf() in Java

java8

public class CharAt_IndexOf_Example {
   public static void main(String args[]){
      String str = "This is tutorialspoint";
      System.out.println("Index of letter 't' = "+ str.indexOf('t', 14));
      System.out.println("Letter at the index 8 is ::"+str.charAt(8));
   }
}

Java program to capitalize each word in the string

java8

public class StringToUpperCaseEmp {
   public static void main(String[] args) {
      String str = "string abc touppercase ";
      String strUpper = str.toUpperCase();
      System.out.println("Original String: " + str);
      System.out.println("String changed to upper case: " + strUpper);
   }
}

Java Program to check whether one String is a rotation of another

java8

public class Sample {
   public static void main(String args[]){
      String str1 = "gala";
      String str2 = "alag";
      String s3 = str1+str1;
      if(s3.contains(str2)) {
         System.out.println("str1 is rotation of str2");
      } else {
         System.out.println("str1 is not rotation of str2");
      }
   }
}

Java String endsWith() method

java8

public class Test {
   public static void main(String args[]) {
      String Str = new String("This is really not immutable!!");
      boolean retVal;
      retVal = Str.endsWith( "immutable!!" );
      System.out.println("Returned Value = " + retVal );
      retVal = Str.endsWith( "immu" );
      System.out.println("Returned Value = " + retVal );
   }
}

Java program reverse tOGGLE each word in the string

java8

import java.lang.StringBuffer;
public class ToggleReverse {
   public static void main(String args[]){
      String sample = "Hello How are you";
      String[] words = sample.split(" ");
      String result = "";
      for(String word:words){
         StringBuffer s = new StringBuffer(word);
         word = s.reverse().toString();
         String firstSub = word.substring(0, 1);
         String secondSub = word.substring(1);
         result = result+firstSub.toLowerCase()+secondSub.toUpperCase()+" ";
      }
      System.out.println(result);
   }
}

intern() method in java

java8

import java.lang.*;
public class StringDemo {
   public static void main(String[] args) {
      String str1 = "This is TutorialsPoint";
      // returns canonical representation for the string object
      String str2 = str1.intern();
      
      // prints the string str2
      System.out.println(str2);
      
      // check if str1 and str2 are equal or not
      System.out.println("Is str1 equal to str2 ? = " + (str1 == str2));
   }
}

Convert String to Date in Java

java8

import java.text.SimpleDateFormat;
import java.util.Date;
public class DateString {
   public static void main(String args[]) throws Exception{
      String date = "21-9-2017";
      SimpleDateFormat sdt = new SimpleDateFormat("dd-MM-YYYY");
      Date result = sdt.parse(date);
      System.out.println(result);
   }
}

Java String isEmpty() method

java8

import java.lang.*;
public class StringDemo {
   public static void main(String[] args) {
      String str = "tutorialspoint";
      //prints length of string
      System.out.println("length of string = " + str.length());
     
      //checks if the string is empty or not
      System.out.println("is this string empty? = " + str.isEmpty());
   }
}

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