Question

int text01=2012；
String entrance= "text01";

How could I get the int value(2012) of ‘text01’ through String ‘entrance’?

Answer 1

If you know what the class is, you can use reflection:

public class Test
{
    int text01 = 2012;
}

And somewhere else, you can get that field’s value by:

String entrance = "text01";
Test t = new Test();

Field f = t.getClass().getDeclaredField(entrance);
System.out.println("value = "+f.getInt(t));

// you can even change the value:
t.text01 = 2013;
System.out.println("value = "+f.getInt(t));

This will print out 2012, then 2013.