Java打破了强类型化！谁能解释呢？

可能的重复：
改变行为以可能损失精度

我在编译时发现了Java强类型检查的不一致。请看下面的代码：

int sum = 0;
sum = 1; //is is OK
sum = 0.56786; //compile error because of precision loss, and strong typing
sum = sum + 2; //it is OK
sum += 2; //it is OK
sum = sum + 0.56787; //compile error again because of automatic conversion into double, and possible precision loss
sum += 0.56787; //this line is does the same thing as the previous line, but it does not give us a compile error, and javac does not complain about precision loss etc.

任何人都可以向我解释一下吗？它是已知的错误，还是所需的行为？C++发出警告，C# 发出编译错误。

Java会破坏强类型吗？您可以将 += 替换为 -= 或 *= - 编译器可以接受所有内容。