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String userInput;
while (userInput = null) {
System.out.println("");
System.out.println(" Enter type: ";
System.out.println(userInput);
userInput = "fred";
System.out.println(userInput);
}

Main.java:1: class, interface, or enum expected
String userInput;
^
Main.java:2: class, interface, or enum expected
while (userInput = null) {
^
Main.java:4: class, interface, or enum expected
System.out.println(" Enter type: ";
^
Main.java:5: class, interface, or enum expected
System.out.println(userInput);
^
Main.java:6: class, interface, or enum expected
userInput = "fred";
^
Main.java:7: class, interface, or enum expected
System.out.println(userInput);
^
Main.java:8: class, interface, or enum expected
}
^
7 errors

Standard output is empty