"How do I check for strings' validity in order to use them in if statement like I just did?"

I keep getting "invalid entry" although I'm typing in "typeA" when running this program to check if it's working. Please let me know what my mistake is.

import java.util.Scanner;

public class taxcalc {

public static void main(String []args){

Scanner input = new Scanner(System.in);

String type; 
int typeAinc, typeBinc, typeCinc, noTypeA, noTypeB, noTypeC;
noTypeA = 0;
noTypeB = 0;
noTypeC = 0;
int totalIncome = 0;

do {
    System.out.println("Enter the customer type as typeA, typeB or typeC; Enter 'done' when you're finished, and remember that your input is case-sensitive!");
    type = input.next();

    if (type != "typeA" && type != "typeB" && type != "typeC" && type != "done") { 
        System.out.println("Entry is not valid!");

    } else if (type == "typeA") {
        noTypeA = noTypeA + 1;
    } else if (type == "typeB") {
        noTypeB = noTypeB + 1;
    } else if (type == "typeC") {
        noTypeC = noTypeC + 1;
    } else {
        System.out.println("The program will terminate soon!");
    }
} while (type != "done");
}

}