Java Grade 11 Beginner Help

[dharav]

Ok so our Teacher In school never gave us the example for the following task and i am really confused i wrote a bit of code but i am lost as of now i spent 5 hours on it with notes give and no hope
This is the task

A)Write a program that asks the user to enter a string, and output the characters in the odd and even positions on two separate lines,
but make sure the characters are aligned with the original string.
Example input: bookkeeping
Output:
b o k e i g
o k e p n

HERE IS WHAT I GOT RIGHT NOW FOR THIS TASK I THINK IM WAY OFF BUT I STILL TRIED

package Stringtask3;
import java.util.Scanner;
public class Stringtask3 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		String i;
		int count=0;
		Scanner keyboard=new Scanner (System.in);
		System.out.println("Please Type Any Single Word");
		i=keyboard.nextLine();
		for(int k=0;k<i.length();k++){
			count++;
			str_array[0]=i.indexOf
		}
		System.out.println(count);
		String[] str_array = new String[2]; 
		str_array[0] = "Java String";
		str_array[1] = "Java String Array";
		     
		System.out.println("Index 0: " + str_array[0]);
		System.out.println("Index 1: " + str_array[1]);
	}

}

B) 1.Ask user to enter a sentence and count how many th are in the sentence.
2.Create a file with 5 sentences (One sentence in a line.) count how many th are in each

Here is what i have for this part here.

package Stringtask4;

import java.io.*;
import java.util.*;
public class Stringtask4 {

	/**
	 * @param args
	 * @throws FileNotFoundException 
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		
		int count =0;
		String l1;
		Scanner Keyboard= new Scanner (System.in);
		System.out.println("Please Type a Scentece In");
		l1=Keyboard.nextLine();
		int ul=0;
		
		for(int i=0;i<length;i++)
		
			{
			ul = l1.indexOf("th");
			count++;
			}
		System.out.println(count+" th's found");
		}
		
	
		String line,line2,line3,line4,line5;
		
		 Scanner in = new Scanner (new File ("Lines.txt"));
		 line=in.nextLine();
		 line2=in.nextLine();
		 line3=in.nextLine();
		 line4=in.nextLine();
		 line5=in.nextLine();
		 System.out.println("These are the inputed 5 senteces from file \n");
		 System.out.println(line+"\n"+line2+"\n"+line3+"\n"+line4+"\n"+line5);
		 
		 
	}

}

[FlyNn]

Whats is the actual problem you are having?

[dharav]

The problem is that they do not function the way they should be therefore i have a error

[Fubarable]

The problem is that they do not function the way they should be therefore i have a error

This tells us nothing about the error or your problem. Please read my link below on how to ask smart questions for more information on what information we need if we're going to have a chance of helping you. Best of luck.