Predefined stream object attached to the standard output in Java console applications.
It's a static variable in Java's System class. This tag is intended for questions about Java applications that write to the standard output.
Questions tagged [system.out]
404 questions
2977
votes
3 answers
Why is printing "B" dramatically slower than printing "#"?
I generated two matrices of 1000 x 1000:
First Matrix: O and #.
Second Matrix: O and B.
Using the following code, the first matrix took 8.52 seconds to complete:
Random r = new Random();
for (int i = 0; i < 1000; i++) {
for (int j = 0; j < 1000;…
Kuba Spatny
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- 63
132
votes
13 answers
How to color System.out.println output?
How can I color Java output?
For example in C and other languages I can use ANSI-escape like \033[0m to do this. But in Java it doesn't work.
public static void main(String[] x) {
System.out.println("\033[0m BLABLA \033[0m\n");
}
Davide Aversa
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92
votes
11 answers
How can I make Java print quotes, like "Hello"?
How can I make Java print "Hello"?
When I type System.out.print("Hello"); the output will be Hello. What I am looking for is "Hello" with the quotes("").
Roy
- 967
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- 7
67
votes
7 answers
difference between System.out.println() and System.err.println()
What is the difference between System.out.println() and System.err.println() in Java?
user354299
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- 5
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- 10
63
votes
19 answers
What's the meaning of System.out.println in Java?
Is this static println function in out class from System namespace?
namespace System {
class out {
static println ...
}
How can I interpret this name? And where in JRE this function is defined? In java.lang.System/java.lang.Object?
prosseek
- 182,215
- 215
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39
votes
3 answers
What is System, out, println in System.out.println() in Java
Possible Duplicate:
What's the meaning of System.out.println in Java?
I was looking for the answer of what System, out and println are in System.out.println() in the Java. I searched and found a different answer like these:
System is a built-in…
Dinup Kandel
- 2,457
- 4
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- 38
26
votes
9 answers
How does System.out.print() work?
I have worked with Java for a quite a long time, and I was wondering how the function System.out.print() works.
Here is my doubt:
Being a function, it has a declaration somewhere in the io package. But how did Java developers do that, since this…
kishoredbn
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- 4
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23
votes
2 answers
Why does `System.out.println(null);` give "The method println(char[]) is ambiguous for the type PrintStream error"?
I am using the code:
System.out.println(null);
It is showing the error:
The method println(char[]) is ambiguous for the type PrintStream
Why doesn't null represent Object?
Kannan Thangadurai
- 1,117
- 2
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- 36
20
votes
8 answers
What is the equivalent of Java's System.out.println() in Javascript?
I am writing some tests for Javascript code and I need to dump some messages during the compile process when errors are encountered.
Is there any equivalent to Java's System.out.println() in Javascript?
P.S.: I also need to dump debug statements…
Jérôme Verstrynge
- 57,710
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- 453
20
votes
3 answers
Why don't we close `System.out` Stream after using it?
I just want to know, we usually close streams at the end, but why don't we close System.out PrintStream with System.out.close()?
Eng.Fouad
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19
votes
3 answers
Race between System.out and System.err in java
Please consider this java code:
public class CMain {
public static void main(String[] args){
for (int i = 0; i < 10; i++) {
System.out.println("A");
System.err.println("B");
}
}
}
By a quick look at…
C graphics
- 7,308
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18
votes
4 answers
How to make a Logger for System.out
I am wondering how to get org.slf4j.Logger for System.out. I know this is not good, but I need it for testing purposes.
Thank you so much.
Anton K.
- 933
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18
votes
5 answers
System.out.print doesn't output to console when running from Junit
When running:
public static void main(String... args) throws InterruptedException {
while (true) {
System.out.print(".");
Thread.sleep(200);
}
}
vs. when running same code from junit:
@Test
public void test() throws…
Lika
- 1,043
- 2
- 10
- 13
16
votes
9 answers
How to set a string's color
Does anyone know how I would set the color of a string that will be printed using System.out?
This is the code I currently have:
System.out.println("TEXT THAT NEEDS TO BE A DIFFERENT COLOR.");
guess who
15
votes
10 answers
How can I disable System.out for speed in Java
I'm writing a program in Java that simulates gravity, and in it I have a bunch of log statements (to System.out). My program is running really slowly, and I think the logging might be part of the reason. Is there any way to disable System.out, so…
Gavin S. Yancey
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