All Questions
12
questions
0
votes
1
answer
83
views
javac reports "package does not exist" even though classpath is set
I have a file Test.java (stripped down for debugging):
import com.github.tkutche1.jgrade.Grade;
I try compiling it with this command line and get an error:
# javac -cp lib/com/github/tkutche1/jgrade/...
- 6,685
1
vote
0
answers
2k
views
Downgrading java version in project (IntelliJ)
I am trying to downgrade the target build version of java, but somehow I can´t change it within IntelliJ, don´t understeand why.
Under File -> Project Structure -> Projects I changed the ...
- 165
4
votes
1
answer
214
views
Problem marking the lines in the java compiler
I am a master's student and I am researching static analysis.
In one of my tests I came across a problem in marking lines in the java compiler.
I have the following java code:
226: String json = &...
0
votes
0
answers
76
views
Java: Safety of rewriting bytecode to add interface
To try to forestall any concern, this is for a personal project. I'm more interested in learning about the internals of the jvm than I am in hearing about what a horrible idea this is :)
Normally, ...
- 642
2
votes
1
answer
341
views
Stack=4 in Java bytecode. How does the Java Compiler compute the 4 value? (depth of the the stack)
Java Code:
public class SimpleRecursion {
public int factorial(int n) {
if (n == 0) {
return 1;
}
return n * factorial(n - 1);
}
}
Gives the following ...
- 57
1
vote
0
answers
2k
views
setting the target version to 1.8 still produce the class files with major version 52
I am trying to compile my java source code to target 1.8. I have set the following in the javac target.
Ant version: Apache Ant(TM) version 1.9.4 compiled on April 29 2014
Java version: 1.8
<...
- 708
3
votes
2
answers
3k
views
Using javap for reading the byte code
I figured out by reading in the internet that java compiles
public class Test {
private String s = "TESTTEST";
}
to
public class Test {
private String s;
public Test() {
s = "...
- 4,617
5
votes
4
answers
2k
views
Java: initialization and costructor of anonymous classes
I would like to understand a strange behavior I faced dealing with anonymous classes.
I have a class that calls a protected method inside its constructor (I know, poor design but that's another story....
- 181
3
votes
3
answers
2k
views
What are the differences of explicit and implicit instantiating String class in java
I have been told that creating String instance like this
String s = new String("Don't do this"); // explicit
has a performance problem since it creates two instance of string on for double quoted ...
- 2,453
-2
votes
5
answers
5k
views
.java file path to class name
What's the most efficient way of getting the class(es) created on a .java file? I have the .java file path and I need to get the class full name.
I can only remember:
Compile it with JavaCompiler
...
- 2,835
2
votes
2
answers
964
views
What javap -c does to a classfile?
Actually, the question is a bit broader.
I know that javac compiles java file into a bytecode, a class file. So, class file should contain jvm instructions and all that. On the other hand, the only ...
- 9,971
1
vote
1
answer
751
views
.class file doesn't have LineNumberTable
In our product there are a few jdk 1.6.0._17 compiled java source files.
They are not giving the line numbers whenever there is an exception in any one of them.
I used javap to find out more about ...
- 101