从 JRuby 实例化非静态 Java 内部类
因此，给出以下 java 类：
class Outer
{
private int x;
public Outer(int x) { this.x = x; }
public class Inner
{
private int y;
public Inner(int y) { this.y = y; }
public int sum() { return x + y; }
}
}
我可以通过以下方式从 Java 创建内部类的实例：
Outer o = new Outer(1);
Outer.Inner i = o.new Inner(2);
但是，我似乎无法从 JRuby 中执行相同的操作
#!/usr/bin/env jruby
require 'java'
java_import 'Outer'
o = Outer.new(1);
i = o.Inner.new(2); #=> NoMethodError: undefined method `Inner' for #<Outer...>
正确的方法是什么？
So given the following java class:
class Outer
{
private int x;
public Outer(int x) { this.x = x; }
public class Inner
{
private int y;
public Inner(int y) { this.y = y; }
public int sum() { return x + y; }
}
}
I can create an instance of the inner class from Java in the following manner:
Outer o = new Outer(1);
Outer.Inner i = o.new Inner(2);
However, I can't seem how to do the same from JRuby
#!/usr/bin/env jruby
require 'java'
java_import 'Outer'
o = Outer.new(1);
i = o.Inner.new(2); #=> NoMethodError: undefined method `Inner' for #<Outer...>
What's the correct way to do this?
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从此讨论中可以看出，您必须执行
Outer:Inner。新（o，2）From what can be seen in this discussion, you'll have to do
Outer:Inner.new(o, 2)