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1. Long type to String type

1. The valueOf() method of String class
String str = (Long val);

2. The toString() method of the Long class
String str = (Long val);

2. Change String type to Long type

Note: Only numbers can be found in the string.

1. The () method of the Long class
Long L = (String str);
The converted value is the Long wrapper type.

2. Long class () method
long l = (String str);
The converted value is a long primitive type.