java - Acess a variable from a method in a another method -
/* * change license header, choose license headers in project properties. * change template file, choose tools | templates * , open template in editor. */ package controle_financeiro; import java.sql.connection; import java.sql.drivermanager; import java.sql.sqlexception; import java.sql.statement; /** * * @author iago */ public class telacadastrocategoria extends javax.swing.jframe { /** * creates new form telacadastrocategoria */ public telacadastrocategoria() { initcomponents(); } @suppresswarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="generated code"> private void initcomponents() { jlabel1 = new javax.swing.jlabel(); nomecategoria = new javax.swing.jtextfield(); botao_cadastra_tela_cadastro_categorias = new javax.swing.jbutton(); botao_voltar_tela_cadastro_categorias = new javax.swing.jbutton(); setdefaultcloseoperation(javax.swing.windowconstants.exit_on_close); jlabel1.setfont(new java.awt.font("tahoma", 0, 18)); // noi18n jlabel1.sethorizontalalignment(javax.swing.swingconstants.center); jlabel1.settext("nome da categoria"); nomecategoria.addmouselistener(new java.awt.event.mouseadapter() { public void mouseclicked(java.awt.event.mouseevent evt) { nomecategoriamouseclicked(evt); } }); botao_cadastra_tela_cadastro_categorias.settext("cadastrar"); botao_cadastra_tela_cadastro_categorias.addmouselistener(new java.awt.event.mouseadapter() { public void mouseclicked(java.awt.event.mouseevent evt) { botao_cadastra_tela_cadastro_categoriasmouseclicked(evt); } }); botao_voltar_tela_cadastro_categorias.settext("voltar"); botao_voltar_tela_cadastro_categorias.addmouselistener(new java.awt.event.mouseadapter() { public void mouseclicked(java.awt.event.mouseevent evt) { botao_voltar_tela_cadastro_categoriasmouseclicked(evt); } }); botao_voltar_tela_cadastro_categorias.addactionlistener(new java.awt.event.actionlistener() { public void actionperformed(java.awt.event.actionevent evt) { botao_voltar_tela_cadastro_categoriasactionperformed(evt); } }); javax.swing.grouplayout layout = new javax.swing.grouplayout(getcontentpane()); getcontentpane().setlayout(layout); layout.sethorizontalgroup( layout.createparallelgroup(javax.swing.grouplayout.alignment.leading) .addgroup(layout.createsequentialgroup() .addgap(98, 98, 98) .addcomponent(jlabel1, javax.swing.grouplayout.preferred_size, 191, javax.swing.grouplayout.preferred_size) .addcontainergap(javax.swing.grouplayout.default_size, short.max_value)) .addgroup(javax.swing.grouplayout.alignment.trailing, layout.createsequentialgroup() .addcontainergap(76, short.max_value) .addgroup(layout.createparallelgroup(javax.swing.grouplayout.alignment.trailing, false) .addgroup(layout.createsequentialgroup() .addcomponent(botao_voltar_tela_cadastro_categorias, javax.swing.grouplayout.preferred_size, 87, javax.swing.grouplayout.preferred_size) .addpreferredgap(javax.swing.layoutstyle.componentplacement.related, javax.swing.grouplayout.default_size, short.max_value) .addcomponent(botao_cadastra_tela_cadastro_categorias, javax.swing.grouplayout.preferred_size, 110, javax.swing.grouplayout.preferred_size)) .addcomponent(nomecategoria, javax.swing.grouplayout.preferred_size, 250, javax.swing.grouplayout.preferred_size)) .addgap(74, 74, 74)) ); layout.setverticalgroup( layout.createparallelgroup(javax.swing.grouplayout.alignment.leading) .addgroup(layout.createsequentialgroup() .addgap(50, 50, 50) .addcomponent(jlabel1, javax.swing.grouplayout.preferred_size, 45, javax.swing.grouplayout.preferred_size) .addgap(40, 40, 40) .addcomponent(nomecategoria, javax.swing.grouplayout.preferred_size, 45, javax.swing.grouplayout.preferred_size) .addpreferredgap(javax.swing.layoutstyle.componentplacement.related, 52, short.max_value) .addgroup(layout.createparallelgroup(javax.swing.grouplayout.alignment.baseline) .addcomponent(botao_cadastra_tela_cadastro_categorias, javax.swing.grouplayout.preferred_size, 43, javax.swing.grouplayout.preferred_size) .addcomponent(botao_voltar_tela_cadastro_categorias, javax.swing.grouplayout.preferred_size, 43, javax.swing.grouplayout.preferred_size)) .addgap(25, 25, 25)) ); pack(); }// </editor-fold> int var_id=1; private void botao_cadastra_tela_cadastro_categoriasmouseclicked(java.awt.event.mouseevent evt) { try { string url = "jdbc:postgresql://localhost:5432/db_controle_financeiro"; string usuario = "us_iago"; string senha = "123"; class.forname("org.postgresql.driver"); connection con; con = drivermanager.getconnection(url, usuario, senha); system.out.println("conexão realizada com sucesso."); statement stm = con.createstatement(); stm.executeupdate("insert categoria (id,nome) values ('" + var_id + "','" + nome_categoria + "'"); var_id++; con.close(); } catch (classnotfoundexception | sqlexception e) { system.out.println("problemas ao conectar ao banco."); } telainicial tela_inicial_ccategoria = new telainicial(); tela_inicial_ccategoria.setvisible(true); dispose(); } private void nomecategoriamouseclicked(java.awt.event.mouseevent evt) { string nome_categoria = (nomecategoria.gettext()); } public static void main(string args[]) { java.awt.eventqueue.invokelater(new runnable() { public void run() { new telacadastrocategoria().setvisible(true); } }); } // variables declaration - not modify private javax.swing.jbutton botao_cadastra_tela_cadastro_categorias; private javax.swing.jbutton botao_voltar_tela_cadastro_categorias; private javax.swing.jlabel jlabel1; public javax.swing.jtextfield nomecategoria; // end of variables declaration } i'm making financial control program in java, i'm having problems acess variable in method method. how can acess variable nome_categoria method nomecategoriamouseclicked in method botao_cadastra_tela_cadastro_categoriasmouseclicked?
you can make variable instance variable. instead of declaring in method, put declaration/assignment @ top. can access anywhere in class.
public class telacadastrocategoria extends javax.swing.jframe { string nome_categoria; // other code goes here } you able use in method of class.
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