[英]Why setVisibleRowCount() does not work in this situation?
我刚刚学习 Swing。我正在尽力为营养价值计算器创建一个菜单。 我不明白为什么setVisibleRowCount()
方法不起作用。 我将该值设置为 1,但行仍然可见。 我希望对这个问题有一个很好的解释。
package inFine;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Main {
public static void main(String[] args) {
JFrame frame=new JFrame("Calculator Valori nutritive");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setSize(500,500);
frame.setLocation(500,100);
frame.setLayout(new BorderLayout());
String []MicDejun= {"Cereale","Ou fiert","Ou prajit","Omleta","Salata rosii","Salata cu bacon ","Ovaz","Sandwitch"};
String []Pranz= {"Spanac","Cartofi prajiti","Linte","Piure","Orez Simplu", "Orez Legume","Brocoli","Piept de pui "
,"Macrou","Somon","Dorada","Ceafa de porc"};
String []Cina= {"Lasagna","Paste","Pizza","Fasole carnati","Encilada","Tigaie picanta","Tigaie tiganeasca","Tocanita"};
String []Snack= {"Chips Lays","Chips Lidl","Chips Carefur","Ciocolata","Corn","Inghetata","Placinta"};
JPanel P_Centru,P_Nord = new JPanel(),P_South=new JPanel();
JPanel P_MicDejun,P_Pranz,P_Cina,P_Snack;
JLabel T_MicDejun=new JLabel("Mic Dejun: ");
JLabel T_Pranz=new JLabel("Pranz: ");
JLabel T_Cina=new JLabel("Cina: ");
JLabel T_Snack=new JLabel("Snack: ");
JList <String>L_MicDejun=new JList<>(MicDejun);
L_MicDejun.setVisibleRowCount(1);
JList <String>L_Pranz=new JList<>(Pranz);
L_Pranz.setVisibleRowCount(1);
JList <String>L_Cina=new JList<>(Cina);
L_Cina.setVisibleRowCount(1);
JList <String>L_Snacks=new JList<>(Snack);
L_Snacks.setVisibleRowCount(1);
JScrollPane scr1=new JScrollPane(L_MicDejun);
JScrollPane scr2=new JScrollPane(L_Pranz);
JScrollPane scr3=new JScrollPane(L_Cina);
JScrollPane scr4=new JScrollPane(L_Snacks);
P_MicDejun=new JPanel();
set(T_MicDejun);
P_MicDejun.add(T_MicDejun);
P_MicDejun.add(L_MicDejun);
P_MicDejun.add(scr1);
P_Pranz=new JPanel();
set(T_Pranz);
P_Pranz.add(T_Pranz);
P_Pranz.add(L_Pranz);
P_Pranz.add(scr2);
P_Cina=new JPanel();
set(T_Cina);
P_Cina.add(T_Cina);
P_Cina.add(L_Cina);
P_Cina.add(scr3);
P_Snack=new JPanel();
set(T_Snack);
P_Snack.add(T_Snack);
P_Snack.add(L_Snacks);
P_Snack.add(scr4);
P_Centru=new JPanel();
P_Centru.setLayout(new GridLayout(4,1));
P_Centru.add(P_MicDejun);
P_Centru.add(P_Pranz);
P_Centru.add(P_Cina);
P_Centru.add(P_Snack);
frame.add(BorderLayout.NORTH,P_Nord);
frame.add(BorderLayout.CENTER,P_Centru);
frame.add(BorderLayout.SOUTH,P_South);
}
public static void set (JLabel a)
{
a.setFont(new java.awt.Font("Arial",Font.PLAIN,12));
a.setForeground(Color.black);
}
}
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