Implementing interfaces in java

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class Main { public static void main(String[] args) { final Printer bigPrinter = new BigPrinter(); bigPrinter.printLine("Hello world!"); final Printer smallPrinter = new Printer() { @Override public void printLine(final String message) { System.out.println(message.toLowerCase()); } }; smallPrinter.printLine("Hello world!"); } }
public interface Printer { public void printLine(final String message); }
public final class BigPrinter implements Printer { @Override public void printLine(final String message) { System.out.println(message.toUpperCase()); } }
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