[FIXED] How to ask user for ONLY one word string input and produce error prompt in a try-catch block

Issue

EDIT: I figured it out! I got rid of the try-catch block because it just didn't work the way I wanted it to. The code below is my final one. Thank you to everyone who responded to this question.

I am trying to code a to-do list program. One function of this program is to search for the entries inside the string array. The user should only input a ONE WORD keyword so if the user inputs more than one word or none, a prompt should show telling the user to try again. The code I've written so far is inside a try-catch statement. Using next() scanner only takes the first word and disregards the rest when inputting a multiple-word keyword, instead of producing an Exception. Here is my code for it:

case 2:
                    String searchKeyword;
                    
                    
                    int success = 0;
                    
                    while(success==0) {
                        System.out.print(">> Enter 1 keyword: ");
                        searchKeyword = sc.nextLine();
                        
                        String splitSearchKeyword[] = searchKeyword.split(" ");
                        
                        if (splitSearchKeyword.length == 1) {
                            if(Quinones_Exer2.searchToDoList(searchKeyword, todoList)==-1) {
                                System.out.println(">> No item found with that keyword!");
                                System.out.println();
                            }
                            else {
                                System.out.println(">> Found one item!");
                                System.out.println("("+(Quinones_Exer2.searchToDoList(searchKeyword, todoList)+1)+")"+" "+todoList[Quinones_Exer2.searchToDoList(searchKeyword, todoList)]);
                                System.out.println();
                            }
                            success++;
                        }
                        else {
                            System.out.println(">> Please input a single word keyword!");
                            System.out.println();
                        }
                    }
                    break;
            }```

Solution

Use Scanner.nextLine() then split the supplied string. If the length of array is greater than 1 or the supplied string is empty then issue an invalid entry message and have the User enter the string over again:

while(tries2 == 0) {
    searchKeyword  = "";
    while (searchKeyword.isEmpty()) {
        System.out.println("Enter 1 keyword: ");
        searchKeyword = sc.nextLine().trim();
        if (searchKeyword.isEmpty() || searchKeyword.split("\\s+").length > 1) {
            System.out.println("Invalid Entry! {" + searchKeyword 
                             + "You must supply a single Key Word!");
            searchKeyword = "";
        }
    }
    tries2++;
    // ... The rest of your code ...
}

Answered By - DevilsHnd
Answer Checked By - Marie Seifert (JavaFixing Admin)