import javax.script.ScriptException;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
public class Solution {
public static TestString testString = new TestString();
public static void main(String[] args) throws ScriptException {
PrintStream consoleStream = System.out;
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
PrintStream stream = new PrintStream(outputStream);
System.setOut(stream);
testString.printSomething();
String result = stream.toString();
System.setOut(consoleStream);
//需要计算result中3+6=的值,该如何计算
System.out.println(result);
}
public static class TestString {
public void printSomething() {
System.out.println("3 + 6 =");
}
}
}