indexOf() error

[Momo Sawada]

hello once again... i have a problem with my indexOf method.... i dont know why... it said in the API i can use it with the util. package.. but it doesn't run... can anyone help me please???
its at line 67...
codecodecode:

public static void main (String args[]) {
    	String[] employees=new String [5];
    	LinkedList link=new LinkedList();
    	for (int i=0; i<employees.length; i++){
    		String a=JOptionPane.showInputDialog ("Enter employee name and number:");
    		employees[i]=a;
    	}
    	for (int i=0; i<employees.length; i++){
    		link.add(employees[i]);
    	}

		while (!link.isEmpty()){
			try{
    			String inter=JOptionPane.showInputDialog ("What would you like to do?"+"\n0: End Program"+"\n1: Insert one employee"+"\n2: Delete one employee"+"\n3: Display List of Employees"+"\n4: Search employee"+"\n5: Update employee information");
    			int swat=Integer.parseInt (inter);
    			switch (swat){

   			 		case 0:
 			   			JOptionPane.showMessageDialog (null, "Mission Complete!","Exercise 5", JOptionPane.PLAIN_MESSAGE);
		    			System.exit(0);
    					break;

    				case 1:
    					String x=JOptionPane.showInputDialog ("Enter employee name and number:");
    					if (x==null||x==""){
    						break;
    					}
    					link.add(x);
    					JOptionPane.showMessageDialog (null, "Employee successfully inserted!");
    					break;

    				case 2:
    					JOptionPane.showMessageDialog (null, "You have chosen to delete the first employee in the list.");
    					link.removeFirst();
    					JOptionPane.showMessageDialog (null, "Employee successfully deleted!");
    					break;

    				case 3:
    					JTextArea output=new JTextArea();
    					Iterator ite3=link.iterator();
    					String outs="ABC Company List of Employees\n\n";
    					while (ite3.hasNext()){
    						outs+=ite3.next()+"\n";
    						output.setText(outs);
    					}
    					JOptionPane.showMessageDialog (null, output, "Exercise 5", JOptionPane.PLAIN_MESSAGE);
    					break;

    				case 4:
    					String h=JOptionPane.showInputDialog ("Enter employee name and number:");
    							if (link.contains(h)){
    								JOptionPane.showMessageDialog (null, "Employee "+h+" found!", "Exercise 5", JOptionPane.PLAIN_MESSAGE);
    							}
    							else{
    								JOptionPane.showMessageDialog (null, "Employee "+h+" not found!", "Exercise 5", JOptionPane.ERROR_MESSAGE);
    							}
    					if (h==null||h==""){
    						JOptionPane.showMessageDialog (null, "No input!", "Exercise 5", JOptionPane.ERROR_MESSAGE);
    						break;
    					}
    					break;

    				case 5:
    					String r=JOptionPane.showInputDialog ("Enter employee name and number you would like to edit:");
    					if  (link.contains(r)){
    						String b=JOptionPane.showInputDialog ("Employee "+r+" found. Enter update data:");
    						int indx=indexOf(r);
    						link.remove(indx);
    						link.add(index, b);
    					}
    					else{
    						JOptionPane.showMessageDialog (null, "Employee "+r+" not found! Cannot edit data!", "Exercise 5", JOptionPane.ERROR_MESSAGE);
    					}
    			}
			}
			catch(NumberFormatException sayop){
				JOptionPane.showMessageDialog (null, "Program exit!", "Exercise 5", JOptionPane.ERROR_MESSAGE);
			}
		}
    	}

thank you very much!!!

[Sean Clark]

Where did you declare your indexOf(..) method?

Or should it actually be link.indexOf(..)?

Sean

[Momo Sawada]

at line 67... i tried using it to get the index of the found element and replacing it with another in the same index....

[Javad Rashidi]

you invoke this method on an String object. where is your String?

[fred rosenberger]

Momo Sawada wrote:at line 67... i tried using it to get the index of the found element and replacing it with another in the same index....

on line 67, you CALL the indexOf() method, not declare it. If you call a method by simply typing the name, Java assumes you are trying to call a method defined in the current class. If you are trying to call the String class' indexOf method, you need to call it on a specific String.

What String is your 'r' supposed to be a substring of? you would need to change 67 to something like

int indx=myString.indexOf(r);

and replace 'myString' with whatever String you are searching.

[Momo Sawada]

oh... i see... thank you!!! i finally had my program running!!! Thank you very much!!!

[fred rosenberger]

glad we could help!

[Campbell Ritchie]

Beware of long lines in code tags; they are difficult to read. And only use spaces for indentation, not tabs.