import sun.security.provider.DSAPrivateKey; //导入依赖的package包/类
public static void main(String args[]) throws Exception {
    for (int i=0; i<10000; i++) {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
        KeyPair kp = kpg.generateKeyPair();
        DSAPrivateKey dpk = (DSAPrivateKey)kp.getPrivate();
        int len = dpk.getX().bitLength();
        if (len <= 152) {
            if (!use(kp)) {
                String os = System.getProperty("os.name");
                // Solaris bug, update the following line once it's fixed
                if (os.equals("SunOS")) {
                    throw new IllegalStateException(
                            "Don't panic. This is a Solaris bug");
                } else {
                    throw new RuntimeException("Real test failure");
                }
            }
            break;
        }
    }
}