实际答案是：一般来说，不应该在运行时使用字符串访问变量。这实际上是合适的例子很少，而且你的例子，简化了，虽然它可能是为了说明的目的，不是一个很好的匹配。
相反，为什么不简单地使用集合或数组来存储对象呢@t、 罗希思在他们的回答中举了一个例子。
不过，下面给出了您的问题的直接答案，因为它适用于java。虽然c#的代码不同，但c#中也提供了可用于此目的的语言特性，即反射。
如果 Obj1 , Obj2 如果在类中声明为静态或示例字段，则可以使用反射通过名称获取它们的值（请参阅java的相关文档）。如果它们是某个方法的本地对象，那么就没有简单的方法可以做到这一点（请参阅以下问题：对于java，对于c#）。

静态场

class Something {
    static Object obj1 = new Object();
    static Object obj2 = new Object();
    // etc.
}

（我冒昧地用小写字母开始字段名，因为这是java中公认的做法。）
在这种情况下，您可以使用以下代码（您需要导入 java.lang.reflect.Field ):

// Get field, named obj1, from class Something.
Field f = Something.class.getDeclaredField("obj1");
// This line allows you access the value of an inaccessible (non-public) field.
f.setAccessible(true);
// Assigning the value of the field, named obj1, to obj.
// You may want to cast to a more concrete type, if you know exactly what is stored in obj1.
// The parameter for get() is ignored for static fields, so simply pass null.
Object obj = f.get(null);
// Now you can do whatever you want with obj, 
// which refers to the same object as static field obj1 of Something.
System.out.println(obj);

示例字段

class Something {
    Object obj1 = new Object();
    Object obj2 = new Object();
    // etc.
}

对于示例字段，可以用几乎完全相同的方法来完成，只需要将类的一个示例传递给 f.get() . 为了举例，假设我们有一个类的示例 Something ，调用 sth .

// Let's say this is an instance of our class
Something sth = new Something();
// ...
// Get field, named obj1, from class Something.
Field f = Something.class.getDeclaredField("obj1");
// This line allows you access the value of an inaccessible (non-public) field.
f.setAccessible(true);
// Assigning the value of the field, named obj1, to obj.
// You may want to cast to a more concrete type, if you know exactly what is stored in obj1.
// The parameter for get() is the instance of Something, 
// for which you want to retrieve the value of an instance field, named obj1.
Object obj = f.get(sth);
// Now you can do whatever you want with obj,
// which refers to the same object as instance field obj1 of sth.
System.out.println(obj);

局部变量

在这种情况下你可能不走运。同样，请参见以下链接：java、c#。

这听起来像是一个经典的策略模式问题策略设计模式

代码如下：

//Declare this in the class so that it can be called by any method
static Object[] array = new Object[4];
public static void main()
{
    //Use this to initialize it
    Object[] array = new Object[4];
    for(int i=0;i<4;i++)
    {
        array[i] = new Object();
    }
    //You can now easily call it
    useObject(0);
    useObject(1);
    useObject(2);
    useObject(3);
}
//Your numbers may be off by 1 because we are using an array but that is easily adjusted
public static void useObject(int objectNumber)
{
    array[objectNumber].doAnythingWithThisObject();
}

答案是。。。不要。改用数组。这正是他们的目的。

ObjectType[] objectArray = new ObjectType[10]; // Or as many as required.
for (int i = 0; i < objectArray.length; i++) {
    objectArray[i] = new ObjectType(); // Or whatever constructor you need.
}
// Then access an individual object like this...
ObjectType obj = objectArray[4];
// Or...
objectArray[5].someMethod();