java - Jar ignoring all methods -

i making pretty simple jar unzip zip , run jar inside of it. problem i've run doesn't @ all.

this main, , class file jar. manifest point correctly it, , loads without errors.

import java.io.file; import java.io.ioexception; import java.io.outputstream; import java.io.filewriter; import java.io.bufferedwriter; import java.io.bufferedoutputstream; import java.io.bufferedinputstream; import java.io.bufferedreader; import java.io.fileoutputstream; import java.io.fileinputstream; import java.io.filenotfoundexception; import java.io.inputstream; import java.io.inputstreamreader; import static java.lang.integer.parseint; import java.net.urlconnection; import java.net.url; import java.util.zip.zipfile; import java.util.zip.zipentry; import java.util.zip.zipinputstream; import java.util.enumeration; import sign.signlink; import java.nio.file.*; import java.io.filereader;      public class clientupdater {      private string filetoextractnew = "/client.zip";      private string getjardir() throws filenotfoundexception, ioexception{             string linebuf="",verstr="";             fileinputstream fis = new fileinputstream("/runlocationurl.txt");             bufferedreader br= new bufferedreader(new inputstreamreader(fis));             while ((linebuf = br.readline()) != null) {                 verstr = linebuf;             }             return verstr;     }      public static void main(string[] args) { system.out.println("start");     }      private void unzip() {     system.out.println("unzipping");         try {             zipentry zipentry;             //client             bufferedinputstream bufferedinputstreamnew = new bufferedinputstream(new fileinputstream(this.filetoextractnew));             zipinputstream zipinputstreamnew = new zipinputstream(bufferedinputstreamnew);              //client             while ((zipentry = zipinputstreamnew.getnextentry()) != null) {                 string stringnew = zipentry.getname();                 file filenew = new file(this.getjardir() + file.separator + stringnew);                 if (zipentry.isdirectory()) {                     new file(this.getjardir() + zipentry.getname()).mkdirs();                     continue;                 }                 if (zipentry.getname().equals(this.filetoextractnew)) {                     this.unzipnew(zipinputstreamnew, this.filetoextractnew);                     break;                 }                 new file(filenew.getparent()).mkdirs();                 this.unzipnew(zipinputstreamnew, this.getjardir() + zipentry.getname());             }             zipinputstreamnew.close();         }         catch (exception var1_2) {             var1_2.printstacktrace();         }     }      private void unzipnew(zipinputstream zipinputstreamnew, string stringnew) throws ioexception {     system.out.println("unzipping new");         fileoutputstream fileoutputstreamnew = new fileoutputstream(stringnew);         byte[] arrby = new byte[4024];         int n = 0;         while ((n = zipinputstreamnew.read(arrby)) != -1) {             fileoutputstreamnew.write(arrby, 0, n);         }         fileoutputstreamnew.close();         runtime.getruntime().exec("java -jar " + getjardir() + "/project pk client.jar");         system.exit(0);     } } 

it shows "start" message, not other 2, never reaches methods. because aren't being called? i'm still learning java.

you have call other methods main. right now, telling computer print start , exit. functions not called existing.

it seems based on quick glance need add unzip(); main function, right after system.out.println line.

to this, need other methods static, need private static void unzip() instead of private void unzip(). other methods too.

import java.io.*; import static java.lang.integer.parseint; import java.net.urlconnection; import java.net.url; import java.util.zip.zipfile; import java.util.zip.zipentry; import java.util.zip.zipinputstream; import java.util.enumeration; import sign.signlink; import java.nio.file.*;  public class clientupdater {      private string filetoextractnew = "/client.zip";      private static string getjardir() throws filenotfoundexception, ioexception{         string linebuf="",verstr="";         fileinputstream fis = new fileinputstream("/runlocationurl.txt");         bufferedreader br= new bufferedreader(new inputstreamreader(fis));         while ((linebuf = br.readline()) != null) {             verstr = linebuf;         }         return verstr;     }      public static void main(string[] args) {         system.out.println("start");         unzip();     }      private static void unzip() {         system.out.println("unzipping");         try {             zipentry zipentry;             //client             bufferedinputstream bufferedinputstreamnew = new bufferedinputstream(new fileinputstream(this.filetoextractnew));             zipinputstream zipinputstreamnew = new zipinputstream(bufferedinputstreamnew);              //client             while ((zipentry = zipinputstreamnew.getnextentry()) != null) {                 string stringnew = zipentry.getname();                 file filenew = new file(this.getjardir() + file.separator + stringnew);                 if (zipentry.isdirectory()) {                     new file(this.getjardir() + zipentry.getname()).mkdirs();                     continue;                 }                 if (zipentry.getname().equals(this.filetoextractnew)) {                     this.unzipnew(zipinputstreamnew, this.filetoextractnew);                     break;                 }                 new file(filenew.getparent()).mkdirs();                 this.unzipnew(zipinputstreamnew, this.getjardir() + zipentry.getname());             }             zipinputstreamnew.close();         }         catch (exception var1_2) {             var1_2.printstacktrace();         }     }      private static void unzipnew(zipinputstream zipinputstreamnew, string stringnew) throws ioexception {         system.out.println("unzipping new");         fileoutputstream fileoutputstreamnew = new fileoutputstream(stringnew);         byte[] arrby = new byte[4024];         int n = 0;         while ((n = zipinputstreamnew.read(arrby)) != -1) {             fileoutputstreamnew.write(arrby, 0, n);         }         fileoutputstreamnew.close();         runtime.getruntime().exec("java -jar " + getjardir() + "/project pk client.jar");         system.exit(0);     } }