问题描述
如果您有一个名为xyz的Java变量。
然后我定义一个字符串，其中包含我想要使用的命名变量的值。
If you have a Java variable named xyz.Then later on I define a string which has the value of the named variable I want to play with.
String x="xyz";
如何让Java将String x识别为变量xyz的指针？
How do I get Java to recognise that String x as a pointer to variable xyz?
一个任意的例子：
JButton a= new JButton();
稍后......
String x="a";
我现在要说的是
JButton called string x.setPreferredSize(new Dimension(40,30));
推荐答案
一般来说，如果你想访问一个变量这样，你必须使用反射，这是较慢且有潜在危险。
In general, if you want to access a variable in this way, you have to use Reflection, which is slower and potentially dangerous.
但是，由于你有一个非常具体的场景，我会采取不同的方法。为什么不把你的按钮或其他元素放到地图中，键是字符串：
However, since you have a very specific scenario in mind, I'd take a different approach. Why not put your buttons or other elements into a map, with keys that are strings:
Map<String, JComponent> currentComponents = new HashMap<String, JComponent>();
currentComponents.put("a", new JButton());
String x = "a";
currentComponents.get(x).setPreferredSize(new Dimension(40,30));
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