javap reports incorrectly aStringBuffer.toString()
javap reports that the toString method of the class String is invoked when it should be the toString method from the class StringBuffer.
Given this program
public class Test2 {
Test2() {
String a ="a", b ="b";
System.out.println(a + b);
}
}
the javap output is
Method Test2()
0 aload_0
1 invokespecial #1 <Method java.lang.Object()>
4 ldc #2 <String "a">
6 astore_1
7 ldc #3 <String "b">
9 astore_2
10 getstatic #4 <Field java.io.PrintStream out>
13 new #5 <Class java.lang.StringBuffer>
16 dup
17 invokespecial #6 <Method java.lang.StringBuffer()>
20 aload_1
21 invokevirtual #7 <Method java.lang.StringBuffer append(java.lang.String)>
24 aload_2
25 invokevirtual #7 <Method java.lang.StringBuffer append(java.lang.String)>
28 invokevirtual #8 <Method java.lang.String toString()>
31 invokevirtual #9 <Method void println(java.lang.String)>
34 return
In line 28 there is a call of the toString method in class String on a StringBuffer object. While the following shows that the constant pool entry number 8 is a symbolic reference to the toString method declared in StringBuffer class:
--
10atag(8)CONSTANT_Methodref
00class_indexjava/lang/StringBuffer
55
00name_and_type_indextoString()Ljava/lang/String;
2519
--
In http://usuarios.tripod.es/JoseBotella a class file parser is freely available for this output to be checked
