Java演習 08 - OIT Archive

work81.java

import java.awt.*;
import java.applet.*;
 
public class work81 extends Applet {
    public void paint(Graphics g) {
	Color c1, c2, c3, c4;
 
	// c1 を生成
	c1 = new Color(64, 128, 160);
 
	g.setColor(c1);
	g.fillRect(20, 20, 70, 70);
 
	// c2 を生成
	c2 = new Color(0Xc1fe80);
	g.setColor(c2);
	g.fillRect(90, 20, 70, 70);
 
	// c3 を生成
	float red, green, blue;
	red = (float)(Math.random());
	green = (float)(Math.random());
	blue = (float)(Math.random());
	c3 = new Color(red, green, blue);
 
	g.setColor(c3);
	g.fillRect(160, 20, 70, 70);
 
	// c4 を生成
	c4 = new Color(120, 220, 250, 128);
	g.setColor(c4);
	g.fillRect(20, 60, 210, 70);
    }
}
 

work82.java

class work82 {
    public static void main(String[] args) {
	Student82 p1 = new Student82(800999, "若馬　大輔");
	Student82 p2 = new Student82(900999, "入門　若葉", 61);
 
	p1.addCredits(45);
	p1.show();
	System.out.println("-------------------------");
	p2.show();
 
	System.out.println("=========================");
 
	p1.addCredits(34);
	p1.show();
	System.out.println("-------------------------");
	p2.addCredits(-10);
	p2.show();
    }
}
 

Student82.java

class Student82 {
    static private final int minimumCredits = 124;
                                            // 卒業必要単位数
    private int id;                         // 学生番号
    private String name;                    // 名前
    private int credits = 0;                // 単位数
 
    Student82(int i, String n){
	setData(i, n);
    }
 
    Student82(int i, String n, int c){
	setData(i, n);
	credits=c;
    }
 
    void show() {
	System.out.println("学生番号 : " + id);
	System.out.println("名前　　 : " + name);
	System.out.println("単位数　 : " + getCredits());
	System.out.println("必要単位 : " + creditsRemainder());
    }
 
    int getCredits() {
	return credits;
    }
 
    void setData(int i, String n) { 
	id = i;
	name = n;
    } 
 
    void addCredits(int n) {
	if (n > 0) {
	    credits = credits + n;
	}
    }
 
    int creditsRemainder() {
	int rem = minimumCredits - credits;
	if (rem < 0) {
	    rem = 0;
	}
	return rem;
    }
 
 
}
 

work83.java

class work83 {
    public static void main(String[] args) {
	Dimension83 p1 = new Dimension83(10, 20);
	Dimension83 p2 = new Dimension83(30);
	Dimension83 p3 = new Dimension83(123, 45);
	/*
	p1.setSize(10, 20);
	p1.show();
 
	p2.setSize(30, 30);
	p2.show();
 
	p3.setSize(123, 45);
	p3.show();
	*/
 
	p1.show();
	p2.show();
	p3.show();
 
	System.out.println("2 番目の正方形のサイズを変更後表示");  
 
	p2.setSize(50, 20);
	p1.show();
	p2.show();
	p3.show();
 
    }
}
 

Dimension83.java

class Dimension83 {
    private int w;
    private int h;
 
    Dimension83(int w0, int h0){
	setSize(w0, h0);
    }
 
    Dimension83(int w0){
	setSize(w0, w0);
    }
 
    void setSize(int w0, int h0){
	w = w0;
	h = h0;
    }
 
    /*
    System.out.println("正方形領域(" + w + " X " + h + ") 面積 = "
				       + w * h);
    */
 
    void show(){
	if(w == h){
	    System.out.print("正方形領域(");
	}else {
	    System.out.print("長方形領域(");
	}
	System.out.println(w + " X " + h + ") 面積 = "+ w * h);
    }
}
 

work84.java

import java.awt.*;
import java.applet.*;
 
public class work84 extends Applet{
    public void paint(Graphics g) {
	PacMan84 p1 = new PacMan84(40, 45);
	PacMan84 p2 = new PacMan84(120, 25, 100);
	/*
	p1.setData(40, 45, 60);
	p1.draw(g);
	p2.setData(120, 25, 100);
	p2.draw(g);
	*/
 
	p1.draw(g);
	p2.draw(g);
    }
}
 

PacMan84.java

import java.awt.*;
import java.applet.*;
 
public class work84 extends Applet{
    public void paint(Graphics g) {
	PacMan84 p1 = new PacMan84(40, 45);
	PacMan84 p2 = new PacMan84(120, 25, 100);
	/*
	p1.setData(40, 45, 60);
	p1.draw(g);
	p2.setData(120, 25, 100);
	p2.draw(g);
	*/
 
	p1.draw(g);
	p2.draw(g);
    }
}
 

work85.java

import java.awt.*;
import java.applet.*;
 
public class work85 extends Applet{
    public void paint(Graphics g){
	PacMan85 p1=new PacMan85(10,80);
	for(int i=0;i<4;i++){
	    p1.draw(g);
	    p1.move(120,-20);
	    p1.enLarge();
	}
 
	PacMan85 p2=new PacMan85(20,20,20);
	for(int i=0;i<4;i++){
	p2.draw(g);
	p2.move(25);
	p2.enLarge(1.2);
	}
    }
}
 

PacMan85.java

import java.awt.*;
 
class PacMan85 {
    private int x;
    private int y;
    private int size;
 
    PacMan85(int x0,int y0,int s0){
	setData(x0,y0,s0);
    }
 
    PacMan85(int x0,int y0){
	setData(x0,y0,60);
    }
 
    void setData(int x0,int y0,int s0){
	x=x0;y=y0;size=s0;
    }
 
    void move(int dx,int dy){
	x=x+dx;y=y+dy;
    }
 
    void move(int d){
	move(d,d);
    }
 
    void enLarge(double mag){
	size=(int)(size*mag);
    }
 
    void enLarge(){
	size=(int)(size*1.1);
    }
 
    void draw(Graphics g){
	g.setColor(Color.pink);
	g.fillArc(x, y, size, size, 45, 300);
	g.setColor(Color.black);
	g.fillOval(x + size / 2, y + size / 12, size / 6, size / 6);
    }
}
 

work86.java

class work86 {
    public static void main(String[] args) {
	Hurrah86 p1= new Hurrah86("井上","がんば！",4);
	Hurrah86 p2= new Hurrah86("斉藤","読め！",3);
	Hurrah86 p3= new Hurrah86("水谷","もうすこし",2);
	Hurrah86 p4= new Hurrah86("小西","ファイト！一発",2);
	p1.shout();
	p2.shout();
	p3.shout();
	p4.shout();
	p1.shout();
	p2.shout("もう諦めるのか？");
	p3.shout();
	p2.shout();
	p1.shout("がんばれ???");
	p1.shout();
	p3.shout("寝るな！");
	p3.shout();
	p4.shout("まだ 8 回目だぞ！");
	p4.shout();
    }
}
 

Hurrah86.java

class Hurrah86 {
    private String name;
    private String msg;
 
    Hurrah86(String n0, String m0, int c0) {
	name = n0;
	msg = "";
	for (int i = 0; i < c0; i++) {
	    msg = msg + m0 + " ";
	}
    }
 
    void shout() {
	shout(msg);
    }
 
    void shout(String word) {
	System.out.println(name + "：" + word);	
    }
}
 

work87.java

// BigInteger と BigDecimal クラスを使うために import する
import java.math.*; // 教科書 184?185 ページの「パッケージを使う」を読もう
import java.math.BigDecimal;
import java.math.BigInteger;
 
 
class work87  {
    public static void main(String[] args) {
	if (args.length == 4) {
	    System.out.println("\n" + args[0] + " と");
	    System.out.println(args[1] + " の和差積商");
	    BigInteger p1 =new BigInteger(args[0]);
	    BigInteger p2 =new BigInteger(args[1]);
 
	    System.out.println("和 = "+ p1.add(p2) );
	    System.out.println("差 = "+ p1.subtract(p2) );
	    System.out.println("積 = "+ p1.multiply(p2) );
	    System.out.println("商 = "+ p1.divide(p2) );
 
	    BigDecimal p3 = new BigDecimal(args[2]);
	    BigDecimal p4 = new BigDecimal(args[3]);
 
	    System.out.println("\n" + args[2] + " と");
	    System.out.println(args[3] + " の和差");
	    System.out.println("和 = "+ p3.add(p4) );
	    System.out.println("差 = "+ p3.subtract(p4) );
 
	    System.out.println("\n" + args[2] + " と");
	    System.out.println(args[3] + " の和差を double で計算すると，");
 
	    Double d2 = Double.parseDouble(args[2]);
	    Double d3 = Double.parseDouble(args[3]);
 
	    System.out.println("和 = " + (d2 + d3));
	    System.out.println("差 = " + (d2 - d3));
 
	    System.out.println("\n" + args[0] + " と");
	    System.out.println(args[1] + " と");
	    System.out.println(args[3] + " の和");
 
	    BigDecimal p5 = new BigDecimal(p1.add(p2));
	    System.out.println("和 = " + p5.add(p4));
 
	} else {
	    System.out.println("引数を 4 個指定してください。" );
	}
    }
}