inner-classes

问题 Im' running this code on a Linux Red Hat with the sun/oracle JVM 1.6_23, inside a VMWare server. After some times the JVM seem to be unable to access my anonymous inner classes. My classpath is fine, since it works for a period. All i got is errors like this one : java.lang.NoClassDefFoundError : com/mycompany/impl/MyClassImpl$1 at com.mycompany.impl.MyClassImpl.markAsDeletable ( MyClassImpl.java :45). line 45 is the first line below, it can't find my new Predicate DomaineVO domaineVO =

问题 From C++ Primer 5th edition By Stanley Lippman et al(19.5): A nested class can have the same kinds of members as a nonnested class. Just like any other class, a nested class controls access to its own members using access specifiers. The enclosing class has no special access to the members of a nested class, and the nested class has no special access to members of its enclosing class . Is there any truth to the bolded part? I could find no mention of the nested class being restricted access

问题 From C++ Primer 5th edition By Stanley Lippman et al(19.5): A nested class can have the same kinds of members as a nonnested class. Just like any other class, a nested class controls access to its own members using access specifiers. The enclosing class has no special access to the members of a nested class, and the nested class has no special access to members of its enclosing class . Is there any truth to the bolded part? I could find no mention of the nested class being restricted access

问题 I am a novice Java programmer trying to use classes defined in a different file. So, I've written these two .java files: First, there's MyLibrary.java: package mymainprogram; public class MyLibrary { public class MyRecord { int number; char letter; } public static int TriplePlusThree(int input_number) { return ((input_number*3) + 3); } } Then, MyMainProgram.java: package mymainprogram; import java.util.Scanner; public class MyMainProgram { public static void main(String[] args) { Scanner

问题 I am a novice Java programmer trying to use classes defined in a different file. So, I've written these two .java files: First, there's MyLibrary.java: package mymainprogram; public class MyLibrary { public class MyRecord { int number; char letter; } public static int TriplePlusThree(int input_number) { return ((input_number*3) + 3); } } Then, MyMainProgram.java: package mymainprogram; import java.util.Scanner; public class MyMainProgram { public static void main(String[] args) { Scanner

问题 I know that to instantiate a member inner class, you have two different constructors: First: Outer out = new Outer(); Outer.Inner in = out.new Inner(); Second: Outer.Inner in = new Outer().new Inner(); Now, I don't know why this code compiles: public class Outer { private String greeting="Hi"; protected class Inner { public int repeat=3; public void go() { for (int i =0; i<repeat; i++) { System.out.println(greeting); } } } public void callInner() { Inner in = new Inner(); //in my opinion the

问题 I know that to instantiate a member inner class, you have two different constructors: First: Outer out = new Outer(); Outer.Inner in = out.new Inner(); Second: Outer.Inner in = new Outer().new Inner(); Now, I don't know why this code compiles: public class Outer { private String greeting="Hi"; protected class Inner { public int repeat=3; public void go() { for (int i =0; i<repeat; i++) { System.out.println(greeting); } } } public void callInner() { Inner in = new Inner(); //in my opinion the

问题 I know that to instantiate a member inner class, you have two different constructors: First: Outer out = new Outer(); Outer.Inner in = out.new Inner(); Second: Outer.Inner in = new Outer().new Inner(); Now, I don't know why this code compiles: public class Outer { private String greeting="Hi"; protected class Inner { public int repeat=3; public void go() { for (int i =0; i<repeat; i++) { System.out.println(greeting); } } } public void callInner() { Inner in = new Inner(); //in my opinion the

问题 static variables in inner classes: inner class cannot contain static fields. It cannot contain static members, because there would be problem where to assign static member. Inner class is connected with outer class. I understand why it does not contain static member, but inner class can contain static constant. Why? Is it specially treated? Is it on special heap? Still it is static member, but constant, so it is specially treated? It can contain: "final static int x", but not "static int x".

问题 I used Kotlin with Spring boot and i met some errors about bean creation. error message was Index 0 out of bounds for length 0 in spring framework class i dont understand why caused exception about this java code(spring) for (int paramIndex = 0; paramIndex < paramTypes.length; paramIndex++) { Class<?> paramType = paramTypes[paramIndex]; String paramName = (paramNames != null ? paramNames[paramIndex] : ""); // Here! ... } is that possible? anyway, i want to know how create spring bean as