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请教低温sealant

请教低温sealant# ChemEng - 化学工程

t*z2010-10-28 07:10

1 楼

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);
}

Z*R2010-10-28 07:10

2 楼

A Soyuz space capsule carrying two Russian crew and an American space
tourist has returned to Earth.
It landed safely in Kazakhstan at 0336GMT, and the crew reported that they
were "feeling well".
On board were Russian cosmonauts Sergei Volkov and Oleg Kononenko, as well
as American Richard Garriott.
Mr Garriott, who paid about $30m (£17m) for the 10-day trip, is
following in the footsteps of his father, who was a Nasa astronaut in the
1970s.
The flight took a new crew to the International

s*l2010-10-28 07:10

3 楼

请问有没有可以常温密封剂（sealant）可以在-60C到+100C左右工作？谢谢！

m*u2010-10-28 07:10

4 楼

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);
: }
: }