String类实现s1>s2的比较

[code]/**
* <code>s1>s2</code>
* @param String s
* The initial value of the string
* @return bool
*/
int opCmp(String s){
return std.string.cmp(cast(char[])this.value, cast(char[])s.value);
}[/code]

下面是测试
[code]public static void main() {
String str = new String("The quick brown fox jumped over the lazy dog.");
String s1 = new String("abc");
s1="abc";
String s2=new String("ab");

writef("s1=");
writefln(s1);
writef("s2=");
writefln(s2);

if(s1>s2)
printf("s1>s2=%.*s\n","true");
else
printf("s1>s2=%.*s\n","false");
String s3=new String("ab");
String s4=new String("abc");

writef("s3=");
writefln(s3);
writef("s4=");
writefln(s4);
if(s3>s4)
printf("s3>s4=%.*s\n","true");
else
printf("s3>s4=%.*s\n","false");

printf("%d\n",str.indexOf("z"));
printf("%d\n",str.isEmpty());
}[/code]