java中String类型转换成基本数据类型总结

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class test {    public static void main(String[] args)     {        String a = "45";        int A = Integer.parseInt(a);        System.out.println(A);        String b = "true";        boolean B = Boolean.parseBoolean(b);        System.out.println(B);        String c = "1";        byte C = Byte.parseByte(c);        System.out.println(C);        String d = "30";        short D = Short.parseShort(d);        System.out.println(D);        String e = "99999999999";        long E = Long.parseLong(e);        System.out.println(E);        //String f = "y";        //char F = Character.parseChar(f);//string转换为char没有这个方法，可以用char a = str.CharAt(index);或char[] strChar = str.toCharArray();        //System.out.println(F);        String g = "2.8778";        float G = Float.parseFloat(g);        System.out.println(G);        String h = "3.788776655555";        double H = Double.parseDouble(h);        System.out.println(H);    }}

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