Everything works fine and matches the example

Question about the task

Reader Wrapper 2

Java Core, Level 9, Lesson 8

Resolved

Everything works fine and matches the example but the testing fails:

public static void main(String[] args) {
        PrintStream backup = System.out;

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        PrintStream printStream = new PrintStream(outputStream);
        System.setOut(printStream);

        new TestString().printSomething();

        String result = outputStream.toString();
        System.setOut(backup);
        StringBuilder sb = new StringBuilder(result);
        while (sb.indexOf("te") != -1) sb.replace(sb.indexOf("te"), sb.indexOf("te") + 2, "??");
        String replacedString = sb.toString();
        System.out.println(replacedString);


    }

    public static class TestString {
        public void printSomething() {
            System.out.println("This is text for testing");
        }
    }

Replace the main method's System.out object with your own reader wrapper similar to the one shown in the lesson.
Your reader wrapper should replace all "te" substrings with "??".
Call testString's existing printSomething() method.
Restore the System.out variable back to the original stream.
Display the modified string.

Requirements:

The Solution class must contain a TestString class.
The Solution class must have a public static TestString field called testString that is initialized immediately.
The TestString class must have a public void printSomething() method.
The TestString class's printSomething() method must display "This is text for testing".
The Solution class's main(String[] args) method must create a PrintStream object (use the PrintStream constructor with a ByteArrayOutputStream parameter).
The Solution class's main(String[] args) method should replace and then restore the console output stream (System.out).
The Solution class's main(String[] args) method must call testString's printSomething() method.
The Solution class's main(String[] args) method must modify the line printed by the printSomething() method, as per the task conditions, and output it to the console.

package com.codegym.task.task19.task1912; /* Reader Wrapper 2 */ import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.PrintStream; public class Solution { public static TestString testString = new TestString(); public static void main(String[] args) { PrintStream backup = System.out; ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); PrintStream printStream = new PrintStream(outputStream); System.setOut(printStream); new TestString().printSomething(); String result = outputStream.toString(); System.setOut(backup); // StringBuilder sb = new StringBuilder(result); // while (sb.indexOf("te") != -1) sb.replace(sb.indexOf("te"), sb.indexOf("te") + 2, "??"); result = result.replaceAll("te", "??"); // String replacedString = sb.toString(); System.out.println(result); } public static class TestString { public void printSomething() { System.out.println("This is text for testing"); } } }

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Anthony Chalk

Level 30 , London, United Kingdom

21 March 2020, 17:40

solution

There's already a TestString object created on line 13. Don't create a new one on line 22.