Complex/素数 LinkedList链表 at master · Xiaofeng7s/Complex · GitHub

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package primeNumber;

import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class PrimeNumbber {

    public static void main(String args[])
    {
        new num();
    }
}

class num extends Frame implements ActionListener {

	Label prompt1, prompt2;
    TextField input1, input2;
    TextArea output;
    Button btn;

    int a, b, k = 0;
    String lst;
    LinkedList<String> list = new LinkedList<>();

    public  num() {

        prompt1 = new Label("请输入数据上限：");
        prompt2 = new Label("请输入数据下限：");
        input1 = new TextField(5);
        input2 = new TextField(5);
        output = new TextArea("",20,60);
        btn = new Button("输出素数");
        add(prompt1);
        add(input1);
        add(prompt2);
        add(input2);
        add(btn);
        add(output);
		output.setBackground(Color.black);
		output.setForeground(Color.green);
        btn.addActionListener(this);
        input1.addFocusListener(new HandleFocus());
        input2.addFocusListener(new HandleFocus());
        addWindowListener(new windowsClose());

        setLayout(new FlowLayout());//少不得，否则add添加的东西会一一覆盖，最后只有最后一个add能显示

        setSize(500,500);
        setTitle("求素数的application");
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        a = Integer.parseInt(input1.getText());
        b = Integer.parseInt(input2.getText());
        output.setText(a+"与"+b+"之间的素数有："+"\n");

        outer_loop:
        for (int i = a; i <= b; i++) {
            for (int j = 2; j <= Math.sqrt(i); j++) {
                if (i % j == 0) {
                    continue outer_loop;
                }
            }
            list.add(i+";");
        }

        for(int m=0;m<list.size();m++) {
        	if(m%10==0) {
        		output.append("\n");
            }
        	output.append(list.get(m));
    }
    }
    class HandleFocus implements FocusListener{
    	public void focusGained(FocusEvent e) {
    		TextField text = (TextField)(e.getSource());
    		text.setBackground(Color.pink);
    		text.setText("");

    	}
    	public void focusLost(FocusEvent e) {
    		TextField text = (TextField)(e.getSource());
    		text.setBackground(Color.white);
    		output.setText(a+"与"+b+"之间的素数有："+"\n");
    		list.clear();
    	}
    }
    class windowsClose extends WindowAdapter{//window监视执行函数
    	public void windowClosing(WindowEvent e)
    	{
    		dispose();
    		System.exit(0);

    	}
    }//end of winC
}