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printstream is output stream object it should be directly used with println() or print() and u r trying to set a object which is a stream "System.setOut(ps);" before doing tht casting of ps object is to be done cast ps to string by using toString() and then set output....code will be same but some changes
PrintStream ps;
System.out.println("a");
ps.toString();
System.setOut(ps);
try this....it might work but im bit unsure of use of printstream as i said its a output object and it has it's own syntax..
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