java - Can't set value on object's variable -
what trying patient id,name,age,disease window 4 text field , search patient details using patient using id.i completed whole task value couldn't save on object's variable though not getting errors.please guys me error.thanks in advance here code:
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package hospital.management; import java.awt.*; import java.awt.event.*; import javax.swing.*; import sun.security.pkcs11.wrapper.constants; public class hospitalmanagement { public static void main(string[] args) { new run().setvisible(true); } } class patient{ private string name,disease ; int p_id,p_age; public void get_name(string n){ name=n; } void get_id(int id){ p_id=id; } void get_disease(string n){ disease=n; } void get_age(int age1){ p_age=age1; } string show_name(){ return name; } int show_id(){ return p_id; } string show_disease(){ return disease; } int show_age(){ return p_age; } } class run extends jframe{ jframe frame=new jframe(); patient[] p1 = new patient[5]; patient patient = new patient(); int cout=0; public run(){ frame.settitle("patient window"); frame.setsize(700,300); frame.setlocation(100,250); frame.getcontentpane().setlayout(new flowlayout(flowlayout.center,15,15)); final jtextfield jid = new jtextfield(20); final jtextfield jage = new jtextfield(20); final jtextfield jname = new jtextfield(20); final jtextfield jdisease = new jtextfield(20); final jtextfield jsid = new jtextfield(20); final jtextarea textarea= new jtextarea(); textarea.seteditable(false); jlabel lbl_name=new jlabel("name:"); jlabel lbl_id=new jlabel("id: "); jlabel lbl_age=new jlabel("age: "); jlabel lbl_disease=new jlabel("disease: "); jlabel lbl_sid=new jlabel("search id: "); jbutton submit = new jbutton("submit"); jbutton search = new jbutton("search"); submit.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent ev) { int id,age; id = integer.parseint(jid.gettext()); patient.get_id(id); string name= jname.gettext(); patient.get_name(name); age=integer.parseint(jage.gettext()); patient.get_age(age); string disease=jdisease.gettext(); patient.get_disease(disease); } }); p1[cout]=patient; cout++; //a.c++; search.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent ev) { int srch_id = integer.parseint(jsid.gettext()); for(int i=0 ;i<2 ;i++){ if(p1[i].show_id()==srch_id){ textarea.append("id: " +p1[i].show_id()+" name: "+p1[i].show_name()+" age: "+p1[i].show_age()+" disease: "+p1[i].show_disease()+constants.newline); } } } }); //textarea.append("id: " +p1[cout].show_id()+" name: "+p1[cout].show_name()+" age: "+p1[cout].show_age()+" disease: "+p1[cout].show_disease()); frame.add(lbl_id); frame.add(jid); frame.add(lbl_name); frame.add(jname); frame.add(lbl_age); frame.add(jage); frame.add(lbl_disease); frame.add(jdisease); frame.add(submit); frame.add(lbl_sid); frame.add(jsid); frame.add(search); frame.add(textarea); frame.pack(); frame.setvisible(true); setdefaultcloseoperation(exit_on_close); setlocationrelativeto(null); } }
1) bug here:
patient[] p1 = new patient[5]; you create array null values.
here:
submit.addactionlistener(new actionlistener() { .... p1[cout].get_id(id); you try call get_id array element, null.
i recommend following: 1) in actionperformed method
patient patient = new patient() // classes should start uppercase letter p1[cout] = patient; 2) in example better substitute array list
3) seems using getters instead of setters ;)
4) recommend refactor code snippet
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