Ignoring upper case and lower case in Java

I want to know how to make whatever the user inputs to ignore case in my method:

public static void findPatient() { if (myPatientList.getNumPatients() == 0) { System.out.println("No patient information is stored."); } else { System.out.print("Enter part of the patient name: "); String name = sc.next(); sc.nextLine(); System.out.print(myPatientList.showPatients(name)); } } 

6 Answers

You have to use the String method .toLowerCase() or .toUpperCase() on both the input and the string you are trying to match it with.

Example:

public static void findPatient() { System.out.print("Enter part of the patient name: "); String name = sc.nextLine(); System.out.print(myPatientList.showPatients(name)); } //the other class ArrayList<String> patientList; public void showPatients(String name) { boolean match = false; for(String matchingname : patientList) { if (matchingname.toLowerCase().contains(name.toLowerCase())) { match = true; } } } 

Use String#toLowerCase() or String#equalsIgnoreCase() methods

Some examples:

 String abc = "Abc".toLowerCase(); boolean isAbc = "Abc".equalsIgnoreCase("ABC"); 

The .equalsIgnoreCase() method should help with that.

use toUpperCase() or toLowerCase() method of String class.

You ignore case when you treat the data, not when you retrieve/store it. If you want to store everything in lowercase use String#toLowerCase, in uppercase use String#toUpperCase.

Then when you have to actually treat it, you may use out of the bow methods, like String#equalsIgnoreCase(java.lang.String). If nothing exists in the Java API that fulfill your needs, then you'll have to write your own logic.

I have also tried all the posted code until I found out this one

if(math.toLowerCase(Locale.ENGLISH)); 

Here whatever character the user input will be converted to lower cases.