Java Programs

Search for a sub-string

• Function, which checks whether one string is a sub-string of another string.

Program

import java.util.Scanner;

public class SubString {

            private static Scanner sc;

            public static void main(String[] args) {

                       

                        String str,substr;

                        sc=new Scanner(System.in);

                        System.out.println("Enter the string:");

                        str=sc.nextLine();

                        System.out.println("Enter the substring:");

                        substr=sc.nextLine();

                        if(str.contains(substr)) {

                                    System.out.println("\""+substr+"\" is a substring of \""+str+"\"");

                        }

                        else {

                                    System.out.println("\""+substr+"\" is not a substring of \""+str+"\"");

                        }

            }

}

Output

Enter the string:

sub-string

Enter the substring:

string

"string" is a substring of "sub-string"

Trim all extra spaces

• Program that accepts a sentence and returns the sentence with all the extra spaces trimmed off. (In a sentence, words need to be separated by only one space; if any two words are separated by more than one space, remove extra spaces)

Program

import java.util.Scanner;

public class RemoveExtraSpace {

            private static Scanner sc;

            public static void main(String[] args) {

                       

                        int len=0;

                        sc=new Scanner(System.in);

                        System.out.println("Enter the String:");

                        String str=sc.nextLine();

                        for(int i=1;i<str.length();i++) {

                                    if(str.charAt(i)==' ') {

                                                len++;

                                    }

                        }

                        for(int j=0;j<len;j++) {

                                    str=str.replaceAll("  ", " ");

                        }

                        System.out.println("The new string is:\n"+str);

            }

}

Output

Enter the String:

Trim    all   extra  spaces.

The new string is:

Trim all extra spaces.