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public class SubString {

	public String subString(String s,int start,int end){
		if(start <0 || end<0 || start >=s.length() || end>=s.length()) return null;
		StringBuffer sb=new StringBuffer();
		for(int i=start;i<end;i++){
			sb.append(s.charAt(i));
		}
		return sb.toString();
	}
	public static void main(String[] args) {
		SubString t=new SubString();
		System.out.println(t.subString("Hello World", 0, 4));
		System.out.println(t.subString("Hello World", 2, 7));
		System.out.println(t.subString("Hello World", 0, 20));
	}

}

public static String substring(String str, int start, int end){
    if(str == null){
        throw new NullPointerException();
    }
    if(end >= str.length() || start > end){
        throw new IllegalArgumentException();
    }
    StringBuilder substring = new StringBuilder();
    for(int i = start; i < end; i++){
        substring.append(str.charAt(i));
    }
    return substring.toString();
}

public class SubString {

	public static void main(String[] args){
		String a ="SampleProgram";
		int start = 0;
		int end = 6;
		StringBuilder sub = new StringBuilder();
		char[] ch = a.toCharArray();
		for(int i=0;i<ch.length;i++){
			if(end == i)
				break;
				sub = sub.append(Character.toString(ch[i]));
			
		}
		System.out.println(sub);
				
	}
}

public class SubString {

	public static void main(String[] args){
		String a ="SampleProgram";
		int start = 0;
		int end = 6;
		StringBuilder sub = new StringBuilder();
		char[] ch = a.toCharArray();
		for(int i=0;i<ch.length;i++){
			if(end == i)
				break;
				sub = sub.append(Character.toString(ch[i]));
			
		}
		System.out.println(sub);
				
	}
}

import java.util.Scanner;

public class SubString {

	static String getSubString(String str, int startIndex, int endIndex) {

		if (str == null) {
			throw new NullPointerException();
		}

		if (endIndex > str.length() || startIndex < 0 || startIndex > endIndex) {
			throw new IllegalArgumentException();
		}

		StringBuilder subString = new StringBuilder();
		for (int i = startIndex; i < endIndex; i++) {
			subString.append(str.charAt(i));
		}
		return subString.toString();
	}

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String str;
		System.out.print("Enter String : ");
		str = sc.next();
		int startIndex, endIndex;
		System.out.print("Enter start index : ");
		startIndex = sc.nextInt();
		System.out.print("Enter end index : ");
		endIndex = sc.nextInt();
		System.out.println("Sub String : "
				+ getSubString(str, startIndex, endIndex));
		sc.close();
	}

}

public class String1{
public static String subString(String str,int spos,int epos)
{
char[] c=str.toCharArray();
String str1='';
for(int i=spos;i<=epos;i++)
{
str1=str1+c[i];
}
return str1;
}
class Test{
public static void main(String[] args)
{
String str=new String("Vamsi Krishna");
System.out.println(String1.subString(str,2,6));
}
}

public static void main(String[] args) {
String str = "Hello world";
int from = 0;
int to = 6;
StringBuffer buffer = new StringBuffer();
if (to < str.length()) {
for (int i = from; i < to; i++) {
buffer.append(str.charAt(i));

}
} else {
System.out.println(" oops !! out of index ");
}
System.out.println(" " + buffer.toString());

}

public static void main(String[] args) {
String str = "Hello world";
int from = 0;
int to = 6;
StringBuffer buffer = new StringBuffer();
if (to < str.length()) {
for (int i = from; i < to; i++) {
buffer.append(str.charAt(i));
}
} else {
System.out.println(" oops !! out of index ");
}
System.out.println(" " + buffer.toString());
}

public class SubString {

public static void main(String[] args) {
String a = "UniqueT";
int start = 1;
int end = 4;
char[] ch = a.toCharArray();
if (start >= 0 && start < a.length() && end < a.length()
&& end >= start) {
for (int i = start; i <= end; i++)
System.out.print(ch[i]);
}

}
}

public class SubString {

public static String getSubString(String string,int start,int end)
{
String temp="";

if(start<end)
{
char ch=' ';
for(int i=start;i<=end;i++)
{
temp=temp+string.charAt(i);
}
}
else{
temp="End index should be less than start index";
}
return temp;
}
public static void main(String[] args)
{
System.out.println(getSubString("12345", 0, 4));
System.out.println(getSubString("12345", 2, 4));
System.out.println(getSubString("12345", 4, 4));
System.out.println(getSubString("12345", 4, 3));
}
}

public class CCSubStringDemo {

	public static void main(String[] args){
		String str="SampleProgramme";
		int start=0;
		int end=6;
		StringBuffer sb=new StringBuffer(str);
	char array[]=new char[6];
	
	sb.getChars(start,end,array,0);
      
	  for(int i=0;i<array.length;i++){
		
		 System.out.print(array[i]);
	  }
	 
				
	}
}