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Move articles out of core-java-lang part 2

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This commit is contained in:
catalin-burcea
2019-10-06 15:57:30 +03:00
parent 7cbe9ac12c
commit 6b80543360
43 changed files with 49 additions and 62 deletions
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17
core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/system/ChatWindow.java
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@@ -1,17 +0,0 @@
package com.baeldung.system;
import java.awt.event.WindowEvent;
/**
* Note: This class is not meant for unit-testing since it uses system
* features at low level and that it uses 'System' gc() which suggests
* JVM for garbage collection. But the usage below demonstrates how the
* method can be used.
*/
public class ChatWindow {
public void windowStateChanged(WindowEvent event) {
if (event.getNewState() == WindowEvent.WINDOW_DEACTIVATED ) {
System.gc(); // if it ends up running, great!
}
}
}

16
core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/system/DateTimeService.java
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@@ -1,16 +0,0 @@
package com.baeldung.system;
import java.util.Date;
public class DateTimeService {
// One hour from now
public long nowPlusOneHour() {
return System.currentTimeMillis() + 3600 * 1000L;
}
// Human-readable format
public String nowPrettyPrinted() {
return new Date(System.currentTimeMillis()).toString();
}
}

7
core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/system/EnvironmentVariables.java
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@@ -1,7 +0,0 @@
package com.baeldung.system;
public class EnvironmentVariables {
public String getPath() {
return System.getenv("PATH");
}
}

18
core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/system/SystemErrDemo.java
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@@ -1,18 +0,0 @@
package com.baeldung.system;
/**
* Note: This class is not meant for unit-testing since it uses system
* features at low level and that it uses 'System' standard error stream
* methods to show output on screen. Also unit-tests in CI environments
* don't have console output for user to see messages. But the usage below
* demonstrates how the methods can be used.
*/
public class SystemErrDemo {
public static void main(String[] args) {
// Print without 'hitting' return
System.err.print("some inline error message");
// Print and then 'hit' return
System.err.println("an error message having new line at the end");
}
}

24
core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/system/SystemExitDemo.java
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@@ -1,24 +0,0 @@
package com.baeldung.system;
/**
* Note: This class is not meant for unit-testing since it uses system
* features at low level and that it uses 'System' exit() which will
* exit the JVM. Also unit-tests in CI environments are not meant to
* exit unit tests like that. But the usage below demonstrates how the
* method can be used.
*/
public class SystemExitDemo {
public static void main(String[] args) {
boolean error = false;
// do something and set error value
if (error) {
System.exit(1); // error case exit
} else {
System.exit(0); // normal case exit
}
// Will not do anything after exit()
}
}

25
core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/system/SystemOutDemo.java
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@@ -1,25 +0,0 @@
package com.baeldung.system;
import java.io.FileNotFoundException;
import java.io.PrintStream;
/**
* Note: This class is not meant for unit-testing since it uses system
* features at low level and that it uses 'System' standard output stream
* methods to show output on screen. Also unit-tests in CI environments
* don't have console output for user to see messages. But the usage below
* demonstrates how the methods can be used.
*/
public class SystemOutDemo {
public static void main(String[] args) throws FileNotFoundException {
// Print without 'hitting' return
System.out.print("some inline message");
// Print and then 'hit' return
System.out.println("a message having new line at the end");
// Changes output stream to send messages to file.
System.setOut(new PrintStream("file.txt"));
}
}

35
core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/system/UserCredentials.java
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@@ -1,35 +0,0 @@
package com.baeldung.system;
import java.io.BufferedReader;
import java.io.Console;
import java.io.IOException;
import java.io.InputStreamReader;
/**
* Note: This class is not meant for unit-testing since it uses system
* features at low level and that it uses 'System' standard input stream
* methods to read text from user. Also unit-tests in CI environments
* don't have console input for user to type in text. But the usage below
* demonstrates how the methods can be used.
*/
public class UserCredentials {
public String readUsername(int length) throws IOException {
byte[] name = new byte[length];
System.in.read(name, 0, length); // by default, from the console
return new String(name);
}
public String readUsername() throws IOException {
BufferedReader reader =
new BufferedReader(new InputStreamReader(System.in));
return reader.readLine();
}
public String readUsernameWithPrompt() {
Console console = System.console();
return console == null ? null : // Console not available
console.readLine("%s", "Enter your name: ");
}
}