Java Code to Create Immutable Class

Rule 1 : Make Class Final
Rule 2 : Make Data Members Final
Rule 3 : Make Parameterized Constructor
Rule 4 : Make Only Getters Not Setters

final class ImmutableCheck{
private final String variable;

public ImmutableCheck(String variable) {
this.variable=variable;
}
public String getVariable() {
return variable;
}

}