模範解答

＜演習１＞の解答例

class iPhone
{
int storage; // ストレージ(GB)
int weight; // 重さ(g)
double disp_size; // ディスプレイサイズ(inch)
}

class Ensyu0801
{
public static void main(String[] args)
{
    iPhone ipSE = new iPhone();
    iPhone ip13 = new iPhone();

    System.out.println("<iPhoneSE>");
    ipSE.storage = 256;
    ipSE.weight = 144;
    ipSE.disp_size = 4.7;
    System.out.println("容量は " + ipSE.storage);
    System.out.println("重さは " + ipSE.weight);
    System.out.println("画面の大きさは " + ipSE.disp_size);

    System.out.println("\n<iPhone13>");
    ip13.storage = 512;
    ip13.weight = 173;
    ip13.disp_size = 6.1;
    System.out.println("容量は " + ip13.storage);
    System.out.println("重さは " + ip13.weight);
    System.out.println("画面の大きさは " + ip13.disp_size);

}
}

＜演習２＞の解答例

class iPhone
{
int storage; // ストレージ(GB)
int weight; // 重さ(g)
double disp_size; // ディスプレイサイズ(inch)

void setStorage( int s ){
    storage = s;
}
void setWeight( int w ){
    weight = w;
}
void setDispSize( double ds ){
    disp_size = ds;
}
}

class Ensyu0802
{
public static void main(String[] args)
{
    iPhone ipSE = new iPhone();
    iPhone ip13 = new iPhone();

    System.out.println("<iPhoneSE>");
    ipSE.setStorage( 256 );
    ipSE.setWeight( 144 );
    ipSE.setDispSize( 4.7 );
    System.out.println("容量は " + ipSE.storage);
    System.out.println("重さは " + ipSE.weight);
    System.out.println("画面の大きさは " + ipSE.disp_size);

    System.out.println("\n<iPhone13>");
    ip13.setStorage( 512 );
    ip13.setWeight( 173 );
    ip13.setDispSize( 6.1 );
    System.out.println("容量は " + ip13.storage);
    System.out.println("重さは " + ip13.weight);
    System.out.println("画面の大きさは " + ip13.disp_size);

}
}

＜演習３＞の解答例

class iPhone
{
int storage; // ストレージ(GB)
int weight; // 重さ(g)
double disp_size; // ディスプレイサイズ(inch)

void show(){
    System.out.println("容量は " + storage);
    System.out.println("重さは " + weight);
    System.out.println("画面の大きさは " + disp_size);
}

void setStorage( int s ){
    storage = s;
}
void setWeight( int w ){
    weight = w;
}
void setDispSize( double ds ){
    disp_size = ds;
}
}

class Ensyu0803
{
public static void main(String[] args)
{
    iPhone ipSE = new iPhone();
    iPhone ip13 = new iPhone();

    System.out.println("<iPhoneSE>");
    ipSE.setStorage( 256 );
    ipSE.setWeight( 144 );
    ipSE.setDispSize( 4.7 );
    ipSE.show();

    System.out.println("\n<iPhone13>");
    ip13.setStorage( 512 );
    ip13.setWeight( 173 );
    ip13.setDispSize( 6.1 );
    ip13.show();
}
}

＜演習４＞の解答例

class iPhone
{
int storage; // ストレージ(GB)
int weight; // 重さ(g)
double disp_size; // ディスプレイサイズ(inch)

void setSpec( int s, int w, double ds ){ // まとめて設定
    storage = s;
    weight = w;
    disp_size = ds;
}

void show(){
    System.out.println("容量は " + storage);
    System.out.println("重さは " + weight);
    System.out.println("画面の大きさは " + disp_size);
}

void setStorage( int s ){
    storage = s;
}
void setWeight( int w ){
    weight = w;
}
void setDispSize( double ds ){
    disp_size = ds;
}
}

class Ensyu0804
{
public static void main(String[] args)
{
    iPhone ipSE = new iPhone();
    iPhone ip13 = new iPhone();

    System.out.println("<iPhoneSE>");
    ipSE.setSpec( 256, 144, 4.7 );
    ipSE.show();

    System.out.println("\n<iPhone13>");
    ip13.setSpec( 512, 173, 6.1 );
    ip13.show();

}
}

＜演習５＞の解答例

class Keisan
{
int val;

void setVal( int v ){
    val = v;
}
void addVal( int v ){
    val += v;
}
int getVal(){
    return val;
}
}

class Ensyu0805
{
public static void main(String[] args)
{
    Keisan a = new Keisan();

    a.setVal( 5 ); // 整数値を設定
    System.out.println(" (1) val = " + a.getVal() );

    a.addVal( 10 ); // 値を加算
    System.out.println(" (2) val = " + a.getVal() );

}
}

＜演習６＞の解答例

class Keisan
{
int val;

// 3つの値の合計をvalに代入する
void setGoukei( int v1, int v2, int v3 ){
    val = v1 + v2 + v3;
}
void setVal( int v ){
    val = v;
}
void addVal( int v ){
    val += v;
}
int getVal(){
    return val;
}
}

class Ensyu0806
{
public static void main(String[] args)
{
    Keisan a = new Keisan();

    a.setVal( 5 ); // 整数値を設定
    System.out.println(" (1) val = " + a.getVal() );

    a.addVal( 10 ); // 値を加算
    System.out.println(" (2) val = " + a.getVal() );

    a.setGoukei( 9, 5, 7 ); // 合計を設定
    System.out.println(" (3) val = " + a.getVal() );

}
}