JAVA.UNINIT.LOCAL_VAR

Uninitialized local variable.

Vulnerability and risk

Using an appropriate value as an initial value when adding or modifying functions may cause unintended operation or inconsistency.

Mitigation and prevention

Local variables should be purposely initialized at declaration time to clarify their use and possible values.

Example 1

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public class C09 {

    int m_i; //OK

    void test(boolean someCond) {

        //detect uninitialized local variable for byte, short, int, long, float, double, boolean, char

       byte byteUninitialized; //NG
       byteUninitialized = 1;
       byte byteInitialized = 1;//OK

       short sUninitalzied; //NG
       sUninitalzied = 1;

       int iUninitalzied; //NG
       iUninitalzied = 1;

       long lUninitalzied; //NG
       lUninitalzied = 1;

       float fUninitalzied; //NG
       fUninitalzied = 0.1F;

       double dbUninitalzied; //NG
       dbUninitalzied = 0.1;

        boolean isUninitialized;//NG
        isUninitialized = false;

        char cUninitalzied; //NG
        cUninitalzied = 'a';

        String sUninialized;//OK

    }

}