t*****z
发帖数: 812 | 1 为什么第一个fail，第二个通过？不就调了一下循序么，百思不解
**fail
public static void main ( String args[] ) {
int x = 50;
System.out.println("x= "+x);
{
int x= 30; //compilation fail: x is already defined in main
System.out.println("x= " + x);
}
}
**pass
public static void main ( String args[] ) {
{
int x= 30;
System.out.println("x= " + x);
}
int x = 50;
System.out.println("x= "+x);
} | m*****u
发帖数: 1342 | 2 I suspect in the second case, the x defined earlier was out of scope when
the second x is being declared, which is not true for the first case.
【在 t*****z 的大作中提到】
: 为什么第一个fail，第二个通过？不就调了一下循序么，百思不解
: **fail
: public static void main ( String args[] ) {
: int x = 50;
: System.out.println("x= "+x);
: {
: int x= 30; //compilation fail: x is already defined in main
: System.out.println("x= " + x);
: }
: }
| r*****l
发帖数: 2859 | 3 Your understanding is right.
【在 m*****u 的大作中提到】
: I suspect in the second case, the x defined earlier was out of scope when
: the second x is being declared, which is not true for the first case.
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