Dart编程实例 - dart字符串
void main() {
String str1 = 'this is a single line string';
String str2 = "this is a single line string";
String str3 = '''this is a multiline line string''';
String str4 = """this is a multiline line string""";
print(str1);
print(str2);
print(str3);
print(str4);
}