java如何在字段为空时中断

Question

   private void loginActionPerformed(java.awt.event.ActionEvent evt) {                                      
        // TODO add your handling code here:
        String Username=username.getText().toString();
        String PassWord=password.getText().toString();

         if(Username.equals("")){ 
             JOptionPane.showMessageDialog(null,"User name is mandatory");
        }
          if(PassWord.equals("")){
              JOptionPane.showMessageDialog(null,"Password is mandatory");
          }

          }

          addJobOpenning second= new addJobOpenning();
          second.setVisible(true); 

Answer 1

没有完全理解，从你的代码我认为你需要打破如果用户名或 密码为空。可以使用return语句

 private void loginActionPerformed(java.awt.event.ActionEvent evt) {                                      
        // TODO add your handling code here:
        String Username=username.getText().toString();
        String PassWord=password.getText().toString();

         if(Username.equals("")){ 
             JOptionPane.showMessageDialog(null,"User name is mandatory");
             return;
        }
          if(PassWord.equals("")){
              JOptionPane.showMessageDialog(null,"Password is mandatory");
              return;
          }

          }

          addJobOpenning second= new addJobOpenning();
          second.setVisible(true);