class B {
int x,y;
int z;
z=x*y;
void show() {
System.out.println(z);
}
}
class A {
public static void main(String as[]) {
B b=new B();
b.show();
}
}
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class B {
int x,y;
int z;
z=x*y;
void show() {
System.out.println(z);
}
}
class A {
public static void main(String as[]) {
B b=new B();
b.show();
}
}
z=x*y;you cant do it here. put it inside constructorYou can't have statements in the class body (
z=x*y;). You have (at least) two options:int z = x * y;use initializer block
These are virtually the same. I'd prefer the first option (cleaner) See here
我认为您的问题出在以下几行：
This first line is perfectly fine - it declares a class instance variable called
zof typeint. This second line, however, is the source of your problem. In Java, it's illegal to have code in a class outside of a class method or static initializer. In this case, the statementz = x * y;is legal Java code, but it has to be inside of a method.要解决此问题，可以将此代码移到构造函数或其他方法中。
提到不在方法体内。你不能那样做。将其移动到构造函数或其他方法。
内部类主体和外部方法主体只能提及字段，方法和内部类声明。