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Declaring variables inside or outside of a loop
...est.java, javap -c Test you'll get:
public class inside.Test extends java.lang.Object{
public inside.Test();
Code:
0: aload_0
1: invokespecial #1; //Method java/lang/Object."<init>":()V
4: return
public static void main(java.lang.String[]);
Code:
0: invokestatic ...
Comparing strings with == which are declared final in Java
...ldc #3; //String ing
5: astore_2
6: new #4; //class java/lang/StringBuilder
9: dup
10: invokespecial #5; //Method java/lang/StringBuilder."<init>":()V
13: aload_1
14: invokevirtual #6; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang...
Runtime Error java.lang.NoSuchMethodError: No virtual method append(Lj...
Runtime Error
java.lang.NoSuchMethodError:
No virtual method append(Ljava/ lang/String;)Ljava/lang/
AbstractStringBuilder; in class Ljava/ lang/StringBuffer; or its super classes (declaration of 'java.lang. StringBuffer' appears in /apex/com.android.art/ javalib/core-oj.jar)
原因：过...
Schema for a multilanguage database
I'm developing a multilanguage software. As far as the application code goes, localizability is not an issue. We can use language specific resources and have all kinds of tools that work well with them.
...
Java Reflection: How to get the name of a variable?
... Then how do you explain this: java.sun.com/javase/6/docs/api/java/lang/reflect/Field.html ?
– Outlaw Programmer
Apr 13 '09 at 15:22
1
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Differences between Exception and Error
...on is Runtime exception, not Error. docs.oracle.com/javase/7/docs/api/java/lang/…
– Gangnus
Mar 14 '19 at 14:20
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Getting attribute using XPath
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How could I get the value of lang (where lang=eng in book title), for
the first element?
Use:
/*/book[1]/title/@lang
This means:
Select the lang attribute of the title element that is a child of the first book child of the top element of the XML ...
StringBuilder vs String concatenation in toString() in Java
...
That's true but the language reference also states that this is optional. In fact, I just did a simple test with JRE 1.6.0_15 and I didn't see any compiler optimization in the decompiled class.
– bruno conde
...
Best way to convert an ArrayList to a string
...e from the for loop from the above program:
61: new #13; //class java/lang/StringBuilder
64: dup
65: invokespecial #14; //Method java/lang/StringBuilder."<init>":()V
68: aload_2
69: invokevirtual #15; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/la...
Cast Object to Generic Type for returning
...ding byte code is:
public static <T> T convertInstanceOfObject(java.lang.Object);
Code:
0: aload_0
1: areturn
2: astore_1
3: aconst_null
4: areturn
Exception table:
from to target type
0 1 2 Class java/lang/ClassCastEx...