how do I write a java method without using an array of strings?
for example:
import java.io.File;
public class rename
{
public static void main(String[] args)
{
File src = new File(args[0]);
File dst = new File("c:\\temp\\temp.txt");
boolean wasRenamed = src.renameTo(dst);
}
}
I don't want to have main use an array of strings but I want rename to work as a class
You should follow standard naming conventions and capitalize the name of your class.
No, you cannot change the signature of main(). This method is the only one that a JVM will 'find' when attempting to execute an application. It is specified by the Java Language Specification.
You are free to write other classes that are invoked by main(). However, every application needs a standard entry point.
- Saish
// Application.java
public class Application {
static final public void main(final String[] args) {
try {
Controller controller = new Controller();
controller.go();
System.exit(0);
}
catch (Throwable e) {
e.printStackTrace();
System.exit(1);
}
}
}
// Controller.java
publc class Controller {
final public void go()
throws Exception {
// spiffy code goes here
}
}
- Saish
Wouldn't a renaming action normally require two arguments: old name and new name? However, it would be easy:
public class Application {
private Application() {
super();
}
static final public void main(final String[] args) {
switch (args.length) {
case 1:
try {
Rename rename = new Rename();
rename.rename(args[0]); // see, it's kind of silly to have same names for class and method
System.exit(0);
}
catch (Throwable e) {
e.printStackTrace();
System.exit(1);
}
break;
default:
System.err.println("Usage: java Application [new name]");
System.exit(1);
}
}
}
class Rename {
public Rename() {
super();
}
final public void rename(final String newName) {
// spiffy code goes here
}
}
- Saish
This probably won't help to OP but in 1.5 main can also be written
public static void main(String ... args) {}
args is still an array, but if you call other main methods from within your own program it may be more convient.
Example:
Rename.main();
Rename.main("alpha");
Rename.main("alpah","beta");
This is what I have, don't understand the last post
import java.io.File;
public class App {
private App() {
super();
}
static final public void main(final String[] args) {
switch (args.length) {
case 1:
try {
Rename rename = new Rename();
rename.rename(args[0]); // see, it's kind of silly to have same names for class and method
System.exit(0);
}
catch (Throwable e) {
e.printStackTrace();
System.exit(1);
}
break;
default:
System.err.println("Usage: java App [new name]");
System.exit(1);
}
}
}
public class Rename {
public Rename() {
super();
}
final public void rename(final String newName) {
File src = new File(newName);
File dst = new File("x:\\temp\\import_uq.txt");
boolean done = src.renameTo(dst);
}
}
This is what I changed it to and am getting an -- Exception in thread "main" java.lang.NoSuchMethodError: main
Sorry this is my first java program
import java.io.File;
class App {
private App() {
super();
}
static final public void main(final String[] args) {
switch (args.length) {
case 1:
try {
Rename rename = new Rename();
rename.rename("c:\\felss\\charles.txt.bak"); // see, it's kind of silly to have same names for class and method
System.exit(0);
}
catch (Throwable e) {
e.printStackTrace();
System.exit(1);
}
break;
default:
System.err.println("Usage: java App [new name]");
System.exit(1);
}
}
}
public class Rename {
public Rename() {
super();
}
final public void rename(final String newName) {
File src = new File(newName);
File dst = new File("c:\\felss\\charles.txt");
boolean done = src.renameTo(dst);
}
}
I got it too work from the command line and I got it finally to recognize by the other program. It is not renaming the file though, it works from a command on the server that the application is running on that is calling this java method. So, I think that I am getting close, thanks for your help.
