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やさしいJava 7
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class Sample1 | |
{ | |
public static void main(String[] args) | |
{ | |
int[] test; | |
test = new int[5]; | |
test[0] = 80; | |
test[1] = 60; | |
test[2] = 22; | |
test[3] = 50; | |
test[4] = 75; | |
for (int i=0; i<5; i++) { | |
System.out.println((i+1) + "番目の人の点数は" + test[i] + "です"); | |
} | |
} | |
} |
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class Sample10 | |
{ | |
public static void main(String[] args) | |
{ | |
int[][] test; | |
test = new int[2][5]; | |
test[0][0] = 80; | |
test[0][1] = 60; | |
test[0][2] = 22; | |
test[0][3] = 50; | |
test[0][4] = 75; | |
test[1][0] = 90; | |
test[1][1] = 55; | |
test[1][2] = 68; | |
test[1][3] = 72; | |
test[1][4] = 58; | |
for (int i=0; i<5; i++) { | |
System.out.println((i+1)+"番目の人の国語の点数は"+test[0][i]+"です"); | |
System.out.println((i+1)+"番目の人の算数の点数は"+test[1][i]+"です"); | |
} | |
} | |
} |
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class Sample11 | |
{ | |
public static void main(String[] args) | |
{ | |
int[][] test = { | |
{80,60,22,50},{90,55,68,72},{33,75,63} | |
}; | |
for (int i=0; i<test.length; i++) { | |
System.out.println((i+1)+"番目の配列要素の長さは"+test[i].length+"です"); | |
} | |
} | |
} |
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import java.io.*; | |
class Sample2 | |
{ | |
public static void main(String[] args) throws IOException | |
{ | |
System.out.println("テストの受験者数を入力してください"); | |
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | |
String str = br.readLine(); | |
int num = Integer.parseInt(str); | |
int[] test; | |
test = new int[num]; | |
System.out.println("人数分の点数を入力してください"); | |
for (int i=0; i<num; i++) { | |
str = br.readLine(); | |
int tmp = Integer.parseInt(str); | |
test[i] = tmp; | |
} | |
for (int i=0; i<num; i++) { | |
System.out.println((i+1) + "番目の人の点数は" + test[i] + "です"); | |
} | |
} | |
} |
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class Sample3 | |
{ | |
public static void main(String[] args) | |
{ | |
// 型名[] 配列変数名 = new 型名[要素数]; | |
int[] test = new int[5]; | |
test[0] = 60; | |
test[1] = 60; | |
test[2] = 22; | |
test[3] = 50; | |
test[4] = 75; | |
for (int i=0; i<5; i++) { | |
System.out.println((i+1)+"番目の人の点数は"+test[i]+"です"); | |
} | |
} | |
} |
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// 配列初期化 | |
class Sample4 | |
{ | |
public static void main(String[] args) | |
{ | |
// 型名[] 配列変数名 = {値1,値2,値3,....} | |
int[] test = {80,60,22,50,75}; | |
for (int i=0; i<5; i++) { | |
System.out.println((i+1)+"番目の人の点数は"+test[i]+"です"); | |
} | |
} | |
} |
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class Sample5 | |
{ | |
public static void main(String[] args) | |
{ | |
int[] test1; | |
test1 = new int[3]; | |
System.out.println("test1を宣言しました。"); | |
System.out.println("配列要素を確保しました。"); | |
test1[0] = 80; | |
test1[1] = 60; | |
test1[2] = 22; | |
int[] test2; | |
System.out.println("test2を宣言しました"); | |
test2 = test1; | |
System.out.println("test2にtest1を代入しました"); | |
for (int i=0; i<3; i++) { | |
System.out.println("test1がさす"+(i+1)+"番目の人の点数は"+test1[i]+"です"); | |
} | |
for (int i=0; i<3; i++) { | |
System.out.println("test2がさす"+(i+1)+"番目の人の点数は"+test2[i]+"です"); | |
} | |
} | |
} |
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class Sample6 | |
{ | |
public static void main(String[] args) | |
{ | |
int[] test1; | |
test1 = new int[3]; | |
System.out.println("test1を宣言しました。"); | |
System.out.println("配列要素を確保しました。"); | |
test1[0] = 80; | |
test1[1] = 60; | |
test1[2] = 22; | |
int[] test2; | |
System.out.println("test2を宣言しました"); | |
test2 = test1; | |
System.out.println("test2にtest1を代入しました"); | |
for (int i=0; i<3; i++) { | |
System.out.println("test1がさす"+(i+1)+"番目の人の点数は"+test1[i]+"です"); | |
} | |
test1[2] = 100; | |
System.out.println("test1がさす3番目の人の点数を変更します"); | |
for (int i=0; i<3; i++) { | |
System.out.println("test1がさす"+(i+1)+"番目の人の点数は"+test1[i]+"です"); | |
} | |
for (int i=0; i<3; i++) { | |
System.out.println("test2がさす"+(i+1)+"番目の人の点数は"+test2[i]+"です"); | |
} | |
} | |
} |
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class Sample7 | |
{ | |
public static void main(String[] args) | |
{ | |
int[] test = {80,60,22,50,75}; | |
for (int i=0; i<5; i++) { | |
System.out.println((i+1)+"番目の人の点数は"+test[i]+"です"); | |
} | |
System.out.println("テストの受験者は" + test.length + "人です"); | |
} | |
} |
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class Sample8 | |
{ | |
public static void main(String[] args) | |
{ | |
int[] test = {80,60,22,50,75}; | |
for (int i=0; i<test.length; i++) { | |
System.out.println((i+1)+"番目の人の点数は"+test[i]+"です"); | |
} | |
System.out.println("テストの受験者は" + test.length + "人です"); | |
} | |
} |
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// たぶんバブルソート | |
import java.io.*; | |
class Sample9 | |
{ | |
public static void main(String[] args) throws IOException | |
{ | |
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | |
int[] test = new int[5]; | |
System.out.println(test.length+"人の点数を入力してください"); | |
for (int i=0; i<test.length; i++) { | |
String str = br.readLine(); | |
test[i] = Integer.parseInt(str); | |
} | |
for (int s=0; s<test.length-1; s++) { | |
for (int t=s+1; t<test.length; t++) { | |
if(test[t] > test[s]) { | |
int tmp = test[t]; | |
test[t] = test[s]; | |
test[s] = tmp; | |
} | |
} | |
} | |
for (int j=0; j<test.length; j++) { | |
System.out.println((j+1)+"番目の人の点数は" + test[j] + "です"); | |
} | |
} | |
} |
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class SampleP2 | |
{ | |
public static void main(String[] args) | |
{ | |
int[] test; | |
test = new int[5]; | |
test[0] = 80; | |
test[1] = 60; | |
test[2] = 22; | |
test[3] = 50; | |
test[4] = 75; | |
// 配列を後から追加できない | |
// test[5] = 100; | |
for (int i=0; i<5; i++) { | |
System.out.println((i+1)+"番目の人の点数は"+test[i]+"です"); | |
} | |
} | |
} |
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class SampleP3 | |
{ | |
public static void main(String[] args) | |
{ | |
int[] test = {80,60,22,50,75,100}; | |
for (int i=0; i<6; i++) { | |
System.out.println((i+1)+"番目の人の点数は"+test[i]+"です"); | |
} | |
} | |
} |
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// たぶんバブルソート | |
import java.io.*; | |
class SampleP4 | |
{ | |
public static void main(String[] args) throws IOException | |
{ | |
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | |
int[] test = new int[5]; | |
System.out.println(test.length+"人の点数を入力してください"); | |
for (int i=0; i<test.length; i++) { | |
String str = br.readLine(); | |
test[i] = Integer.parseInt(str); | |
} | |
for (int s=0; s<test.length-1; s++) { | |
for (int t=s+1; t<test.length; t++) { | |
if(test[t] > test[s]) { | |
int tmp = test[t]; | |
test[t] = test[s]; | |
test[s] = tmp; | |
} | |
} | |
} | |
for (int j=0; j<test.length; j++) { | |
System.out.println((j+1)+"番目の人の点数は" + test[j] + "です"); | |
} | |
System.out.println("最高点は" + test[0] + "点です"); | |
} | |
} |
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