NSString *a=@"abcd";
NSString *b=@"abcd";
NSString *c= [NSString stringWithFormat:@"abcd"];
NSString *d=@"bcd";
NSLog(@"%p %p %p ",a,b,c);
NSLog(@"%d",[a isEqualToString:b]);
NSLog(@"%d",[a isEqualToString:c]);
NSLog(@"%d",[a isEqual:b]);
NSLog(@"%d",a==b);
打印结果
[17901:590443] 0x10c945190 0x10c945190 0xa000000646362614 0x10c9451b0
[17901:590443] 1
[17901:590443] 1
[17901:590443] 1
[17901:590443] 0
