43 lines
1.8 KiB
Java
43 lines
1.8 KiB
Java
package decorator;
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public class Main {
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public static void main(String[] args) {
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System.out.println("=== Decorator Design Pattern Demo ===\n");
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String input = " hello world, badword is here ";
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System.out.println("Input: \"" + input + "\"\n");
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// Stack 1: just trim
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TextProcessor trimOnly = new TrimDecorator(new PlainTextProcessor());
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System.out.println("Trim only: \"" + trimOnly.process(input) + "\"");
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// Stack 2: trim first (innermost), then uppercase (outermost)
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// Execution order: PlainText → Trim → UpperCase
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TextProcessor trimThenUpper =
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new UpperCaseDecorator(
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new TrimDecorator(
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new PlainTextProcessor()));
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System.out.println("Trim + UpperCase: \"" + trimThenUpper.process(input) + "\"");
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// Stack 3: trim, filter profanity, then uppercase
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TextProcessor full =
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new UpperCaseDecorator(
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new ProfanityFilterDecorator(
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new TrimDecorator(
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new PlainTextProcessor())));
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System.out.println("Trim + Filter + Upper: \"" + full.process(input) + "\"");
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// Stack 4: filter THEN trim — different result because order changed
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TextProcessor filterFirst =
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new TrimDecorator(
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new ProfanityFilterDecorator(
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new PlainTextProcessor()));
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System.out.println("Filter + Trim: \"" + filterFirst.process(input) + "\"");
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System.out.println("\n--- JDK equivalent ---");
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System.out.println("new BufferedReader(new InputStreamReader(socket.getInputStream()))");
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System.out.println("Same pattern: each wrapper adds one behaviour, order matters.");
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System.out.println("\n=== Demo complete ===");
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}
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}
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