int result1, result2, result3, result4, result5;

result1 = 85;
result2 = 78;
result3 = 92;
result4 = 62;
result5 = 69;

int result1, result2, result3, result4, result5;

result1 = 85;
result2 = 78;
result3 = 92;
result4 = 62;
result5 = 69;

System.out.println(result1);
System.out.println(result2);
System.out.println(result3);
System.out.println(result4);
System.out.println(result5);

int result[] = new int[5];

result[0] = 85;
result[1] = 78;
result[2] = 92;
result[3] = 62;
result[4] = 69;

int result[] = new int[5];

result[0] = 85;
result[1] = 78;
result[2] = 92;
result[3] = 62;
result[4] = 69;

for (int i = 0; i < 5; i++){
  System.out.println(result[i]);
}

int result[] = {85, 78, 92, 62, 69};

for (int i = 0; i < 5; i++){
  System.out.println(result[i]);
}

サンプルプログラム

class JSample1_1{
  public static void main(String args[]){
    int result[] = {85, 78, 92, 62, 69};

    for (int i = 0; i < 5; i++){
      System.out.println(result[i]);
    }
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample1_1
85
78
92
62
69
[xxxxxxxx@dddddddddd Array]$ 

型名 配列変数名[];

型名 配列変数名[];
配列変数名 = new 型名[要素数];

型名 配列変数名[] = new 型名[要素数];

int a[];
a = new int[5];

int b[] = new int[5];

配列の宣言の別の方法

型名[] 配列変数名;

int[] a;
a = new int[5];

int[] b = new int[5];

サンプルプログラム

class JSample2_1{
  public static void main(String args[]){
    char[] moji;
    moji = new char[2];

    moji[0] = 'A';
    moji[1] = '漢';

    for (int i = 0; i < 2; i++){
      System.out.println(moji[i]);
    }
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample2_1
A
漢
[xxxxxxxx@dddddddddd Array]$ 

int n[];

int n[];
n = new int[5];

参照型変数の値を代入

int n[] = new int[3];
int m[];

m = n;

サンプルプログラム

class JSample3_1{
  public static void main(String args[]){
    int n[];
    int m[];

    n = new int[2];
    System.out.println(n);

    n[0] = 10;

    m = n;
    System.out.println(m);
    System.out.println("n[0] = " + n[0]);
    System.out.println("m[0] = " + m[0]);
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample3_1
[I@15db9742
[I@15db9742
n[0] = 10
m[0] = 10
[xxxxxxxx@dddddddddd Array]$ 

配列変数[インデックス]

int n[] = new int[5];

n[0] = 10;
n[1] = 14;
n[2] = 24;
n[3] = 18;
n[4] = 22;

System.out.println(n[0]);
int sum = n[1] + n[2];
n[4] = n[3] * 5;

不正なインデックス

int n[];
n = new int[5];

n[7] = 15;

インデックスを変数で指定

int n[] = new int[5];

int index = 0;
n[index] = 15;

int n[] = new int[3];

n[0] = 10;
n[1] = 20;
n[2] = 18;

for (int i = 0; i < 3; i++){
  System.out.println(n[i]);
}

サンプルプログラム

class JSample4_1{
  public static void main(String args[]){
    int n[] = new int[3];

    n[0] = 20;
    n[1] = 18;
    n[2] = n[0] * 2 + n[1];

    System.out.println(n[2]);
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample4_1
58
[xxxxxxxx@dddddddddd Array]$ 

型名 変数名 = 初期値;

型名 配列変数名[] = {値1, 値2, ... };

int n[] = {18, 29, 36, 12};

int n[];
n = new int[4];

n[0] = 18;
n[1] = 29;
n[2] = 36;
n[3] = 12;

サンプルプログラム

class JSample5_1{
  public static void main(String args[]){
    int n[] = {18, 29, 36, 12};

    for (int i = 0; i < 4; i++){
      System.out.println(n[i]);
    }
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample5_1
18
29
36
12
[xxxxxxxx@dddddddddd Array]$ 

配列変数名.length

int n[] = {18, 29, 36, 12};

System.out.println(n.length);

int n[] = {18, 29, 36, 12};

for (int i = 0; i < n.length; i++){
  System.out.println(n[i]);
}

サンプルプログラム

class JSample6_1{
  public static void main(String args[]){
    int n[] = {18, 29, 36, 12};

    for (int i = 0; i < n.length; i++){
      System.out.println(n[i]);
    }
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample6_1
18
29
36
12
[xxxxxxxx@dddddddddd Array]$ 

int kokugo[] = {80, 92, 45};
int sansu[] = {75, 89, 54};

型名 配列変数名[];

int[] seiseki[];

int seiseki[][];
int[][] seiseki;

多次元配列の要素の確保

型名 配列変数名[][];
配列変数名 = new 型名[要素数][];

int seiseki[][];
seiseki = new int[2][];

int seiseki[][];
seiseki = new int[2][];

int kokugo[];
kokugo = new int[3];
kokugo[0] = 80;
kokugo[1] = 92;
kokugo[2] = 45;

int sansu[];
sansu = new int[3];
sansu[0] = 75;
sansu[1] = 89;
sansu[2] = 54;

seiseki[0] = kokugo;
seiseki[1] = sansu;

int seiseki[][];
seiseki = new int[2][];

seiseki[0] = new int[3];
seiseki[1] = new int[3];

seiseki[0][0] = 80;
seiseki[0][1] = 92;
seiseki[0][2] = 45;

seiseki[1][0] = 75;
seiseki[1][1] = 89;
seiseki[1][2] = 54;

int seiseki[][];
seiseki = new int[2][3];

seiseki[0][0] = 80;
seiseki[0][1] = 92;
seiseki[0][2] = 45;

seiseki[1][0] = 75;
seiseki[1][1] = 89;
seiseki[1][2] = 54;

型名 配列変数名[][];
配列変数名 = new 型名[要素数][値の配列の要素数];

型名 配列変数名[][] = new 型名[要素数][値の配列の要素数];

int seiseki[][] = new int[2][3];

seiseki[0][0] = 80;
seiseki[0][1] = 92;
seiseki[0][2] = 45;

seiseki[1][0] = 75;
seiseki[1][1] = 89;
seiseki[1][2] = 54;

サンプルプログラム

class JSample7_1{
  public static void main(String args[]){
    int seiseki[][] = new int[2][3];

    seiseki[0][0] = 80;
    seiseki[0][1] = 92;
    seiseki[0][2] = 45;

    seiseki[1][0] = 75;
    seiseki[1][1] = 89;
    seiseki[1][2] = 54;

    String kyoka[] = {"国語", "数学"};

    for (int i = 0; i < 2; i++){
      System.out.println(kyoka[i] + "の成績");

      for (int j = 0; j < 3; j++){
        System.out.println(seiseki[i][j]);
      }
    }
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample7_1
国語の成績
80
92
45
数学の成績
75
89
54
[xxxxxxxx@dddddddddd Array]$ 

型名 配列変数名[] = {値1, 値2, ..};

型名 配列変数名1[] = {値1, 値2, ..};
型名 配列変数名2[] = {値1, 値2, ..};

型名 配列変数名[][] = {配列変数名1, 配列変数名2};

型名 配列変数名[][] = {{値1_1, 値1_2, ..}, {値2_1, 値2_2, ..}};

int num[][] = {{10, 8, 5}, {9, 16, 4}, {3, 7, 5}};

int num[][] = new int[2][3];

num[0][0] = 10;
num[0][1] = 8;
num[0][2] = 5;

num[1][0] = 9;
num[1][1] = 16;
num[1][2] = 4;

num[2][0] = 3;
num[2][1] = 7;
num[2][2] = 5;

int num[][] = {
  {10, 8, 5}, 
  {9, 16, 4}, 
  {3, 7, 5}
};

サンプルプログラム

class JSample8_1{
  public static void main(String args[]){
    int seiseki[][] = {
      {68, 82, 92},
      {76, 33, 83},
      {92, 45, 38}
    };

    String kurasu[] = {"Aクラス", "Bクラス", "Cクラス"};

    for (int i = 0; i < 3; i++){
      System.out.println(kurasu[i] + "の成績");

      for (int j = 0; j < 3; j++){
        System.out.println(seiseki[i][j]);
      }
    }
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample8_1
Aクラスの成績
68
82
92
Bクラスの成績
76
33
83
Cクラスの成績
92
45
38
[xxxxxxxx@dddddddddd Array]$ 

配列変数名.length

int num[][] = {{1, 3, 5}, {2, 4, 6}};

System.out.println(num.length);

配列変数名[インデックス].length

int num[][] = {{1, 3, 5}, {2, 4, 6}};

System.out.println(num[0].length);
System.out.println(num[1].length);

サンプルプログラム

class JSample9_1{
  public static void main(String args[]){
    int num[][] = {{1, 3, 5}, {2, 4, 6}};

    System.out.print("多次元配列の長さは");
    System.out.println(num.length);

    System.out.print("インデックス0の要素の長さは");
    System.out.println(num[0].length);

    System.out.print("インデックス1の要素の長さは");
    System.out.println(num[1].length);
  }
}

[xxxxxxxx@dddddddddd Array]$ java JSample9_1
多次元配列の長さは2
インデックス0の要素の長さは3
インデックス1の要素の長さは3
[xxxxxxxx@dddddddddd Array]$