How to change String to double ?

I want to change String to double in Applet program, but for the run time, error is occurred.
It can not find the method parseDouble.
Error -> Double.parseDouble("7.5");
I try to test String to Integer, it works fine.
OK -> Integer.parseInt("7");
How to change String to double in Applet ?

Yea, the Double.parseDouble method came in a later release (first time in 1.2).

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