小编pel*_*ele的帖子

System.out.println(1 + 2 + "3");

产量:33

System.out.println("1" + 2 + 3);

输出:123

int a = 1, b;
if(a > 0) b = 1;
if(a <= 0) b = 2;
System.out.println(b);

如果我运行这个,我收到:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
 The local variable b may not have been initialized

 at Broom.main(Broom.java:9)

我知道局部变量没有初始化,你有责任这样做,但在这种情况下,第一个if不初始化变量？