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How to get Android crash logs?
...g due to uncaught exception
09-04 21:35:15.397: ERROR/AndroidRuntime(778): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dazlious.android.helloworld/com.dazlious.android.helloworld.main}: java.lang.ArrayIndexOutOfBoundsException
09-04 21:35:15.397: ERROR/AndroidRuntime(778):...
Java Reflection Performance
...oking up a class via reflection is, by magnitude, more expensive.
Quoting Java's documentation on reflection:
Because reflection involves types that are dynamically resolved, certain Java virtual machine optimizations can not be performed. Consequently, reflective operations have slower perform...
Why is Class.newInstance() “evil”?
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The Java API documentation explains why (http://java.sun.com/javase/6/docs/api/java/lang/Class.html#newInstance()):
Note that this method propagates any exception thrown by the nullary constructor, including a checked excepti...
What are all the escape characters?
I know some of the escape characters in Java, e.g.
4 Answers
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How to print out all the elements of a List in Java?
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Since Java 8, List inherits a default "forEach" method which you can combine with the method reference "System.out::println" like this:
list.forEach(System.out::println);
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kill -3 to get java thread dump
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With Java 8 in picture, jcmd is the preferred approach.
jcmd <PID> Thread.print
Following is the snippet from Oracle documentation :
The release of JDK 8 introduced Java Mission Control, Java Flight Recorder, and jcmd ...
Double vs. BigDecimal?
...mal. Otherwise Doubles tend to be good enough.
I do recommend reading the javadoc of BigDecimal as they do explain things better than I do here :)
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How to capitalize the first letter of a String in Java?
I am using Java to get a String input from the user. I am trying to make the first letter of this input capitalized.
55 ...
How to read environment variables in Scala
In Java, reading environment variables is done with System.getenv() .
6 Answers
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Get string character by index - Java
...ystem.out.println(charAtZero); // Prints f
For more information, see the Java documentation on String.charAt. If you want another simple tutorial, this one or this one.
If you don't want the result as a char data type, but rather as a string, you would use the Character.toString method:
String t...