StringBuilder ucina stringa

package pl.allst.rpi;

import java.io.*;

public class RPIStatus {
	private static String name="";
	private static Runtime r;
	private static Process p;
	private static StringBuilder sb;
	
	public static String getName(){
		if(name == null){
			try{
			r = Runtime.getRuntime();
			Process p = r.exec("uname -a");
			p.waitFor();
			BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
			sb = new StringBuilder();
			sb.append(b.readLine());
			b.close();		
			return sb.toString();
			}catch(IOException | InterruptedException e){
				return e.getStackTrace().toString();
			}
		}else{
			return name;
		}
	}
	public static String getProcLoad(){
		try{
		r = Runtime.getRuntime();
		//CPU INFO 
		p = r.exec(System.getProperty("user.home")+"/.config/RPIStatus/cpuLoad");
		p.waitFor();
		BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
		sb = new StringBuilder();
		sb.append(b.readLine());
		b.close();
		return sb.toString();
		}catch(IOException | InterruptedException e){
			return e.getStackTrace().toString();
		}
	}
	public static String getProcTemp(){
		try{
			r = Runtime.getRuntime();
			//CPU INFO -Temp
			p = r.exec("/opt/vc/bin/vcgencmd measure_temp");
			p.waitFor();
			BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
			sb = new StringBuilder();
			sb.append(b.readLine());
			b.close();
			return sb.toString().substring(5);
			}catch(IOException | InterruptedException e){
				return e.getStackTrace().toString();
			}
		
	}
	public static String getRamTotal(){
		try{
			r = Runtime.getRuntime();
			p = r.exec(System.getProperty("user.home")+"/.config/RPIStatus/cpuLoad");
			p.waitFor();
			BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
			sb = new StringBuilder();
			sb.append(b.readLine());
			b.close();
			String line = sb.toString();
			sb=new StringBuilder();
			
			for(int i=0;i<line.length();i++){
				if(Character.isDigit(line.charAt(i)))
					sb.append(line.charAt(i));
			}
			
			return sb.toString();
			}catch(IOException | InterruptedException e){
				return e.getStackTrace().toString();
			}
		
	}
	public static String getRamUsage(){
		try{
			r = Runtime.getRuntime();
			p = r.exec("cat /proc/meminfo | grep MemAvailable");
			p.waitFor();
			BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
			sb = new StringBuilder();
			sb.append(b.readLine());
			b.close();
			String line = sb.toString();
			sb=new StringBuilder();
			
			for(int i=0;i<line.length();i++){
				if(Character.isDigit(line.charAt(i)))
					sb.append(line.charAt(i));
			}
			
			return sb.toString();
			}catch(IOException | InterruptedException e){
				return e.getStackTrace().toString();
			}
		
	}
	public static String getLoggedPpl(){
		try{
			r = Runtime.getRuntime();
			p = r.exec("who");
			p.waitFor();
			BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
			sb = new StringBuilder("");
			String line="";
			while((line=b.readLine())!=null){
				sb.append(line);
				sb.append("\n");
			}			
			b.close();
			return sb.toString();
			}catch(IOException | InterruptedException e){
				return e.getStackTrace().toString();
			}
		
	}
	public static void initPath(){
		
		File file = new File(System.getProperty("user.home")+"/.config/RPIStatus/cpuLoad");
		if(!file.exists()){
			try {
				file.createNewFile();
			} catch (IOException e) {
				e.printStackTrace();
			}
			if(!file.exists()){
				System.out.println("Error: File was not created");
			}
			else{
				try{
				FileWriter writer = new FileWriter(file);
				writer.write("grep 'cpu ' /proc/stat | awk '{usage=($2+$4)*100/($2+$4+$5)} END {print usage}'");
				writer.close();
				r = Runtime.getRuntime();
				p = r.exec("chmod +x "+file.getAbsolutePath());
				p.waitFor();
				}catch(IOException | InterruptedException e){
					e.printStackTrace();
				}
			}
		}
	}
	public static String processInput(String inputLine) {
		if(inputLine.equals("TEST"))
			return "OK";
		else{
			sb=new StringBuilder("");
			sb.append("Name: ");
			sb.append(getName());
			sb.append("\n");
			sb.append("CPUusage: ");
			sb.append(getProcLoad());
			sb.append("\n");
			sb.append("ProcTemp: ");
			sb.append(getProcTemp());
			sb.append("\n");
			sb.append("RamTotal: ");
			sb.append(getRamTotal());
			sb.append("\n");
			sb.append("RamUsage: ");
			sb.append(getRamUsage());
			sb.append("\n");
			sb.append("LoggedPPL: ");
			sb.append(getLoggedPpl());
			sb.append("\n");
			sb.append("Czemu to nie dziala");<--- Efekt desperacji 
			sb.append("Czemu to nie dziala");
			sb.append("Czemu to nie dziala");
			sb.append("Czemu to nie dziala");
			System.out.println(sb.toString());
			return sb.toString();
		}
	}
	
}

pi       :0           2016-03-30 18:39 (:0)
pi       tty1         2016-03-30 18:39
pi       pts/0        2016-04-02 20:38 (185.124.117.143)

Czemu to nie dzialaCzemu to nie dzialaCzemu to nie dzialaCzemu to nie dziala
 

public static String processInput(String inputLine) {
        if(inputLine.equals("TEST"))
            return "OK";
        else{     
            StringBuilder sb=new StringBuilder(""); //  <-------------- w tej linii zmiana
            sb.append("Name: ");
            sb.append(getName());
            sb.append("\n");
                     .
                     .
                     .
       }
}