JAVA.SWITCH.DEFAULT.POSITION

The default label is not at the beginning or end of a switch statement.

Vulnerability and risk

If the default label is not placed at the beginning or end of a switch statement, maintainability may be impaired, or incorrect coding may cause unintended behavior.

Mitigation and prevention

Place the default label at the beginning or end of the switch statement.

Example 1

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public class C03 {
    
    /* default located at first */
    public void testOK1(int num) {
        switch (num) {
        default:
            break;
            
        case 1:
            break;
        case 2:
            break;
        
        }
        
        
    
    }
    
    /* default located at last */
    public void testOK2(int num) {
        
        switch (num) {            
        case 1:
            break;
        case 2:
            break;
        default:
            break;
        }
    }
    
    
    /* default located in the middle */
    public void testNG1(int num) {
        switch (num) {            
        case 1:
            break;
        default:
            break;
        case 2:
            break;
        }
        
    }
    

}