Dart编程实例 - 类型测试操作符 is!
void main() {
double n = 2.20;
var num = n is! int;
print(num);
}
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void main() {
double n = 2.20;
var num = n is! int;
print(num);
}
## Dart编程实例 - Enabling Checked Mode```dartvoid main() { int n=hello; print(n); } ```
## Dart编程实例 - Dart 面向对象编程```dartclass TestClass { void disp() { print(Hello World); }} void main() { TestClass c = new TestClass(); c.d