「Java」Math.random()でランダム文字列を生成するサンプル
説明
double java.lang.Math.random()
戻り値:0.0以上1.0未満の擬似乱数double。
コード
package com.example;
public class RndomStrCreateDemo {
public static void main(String[] args) {
StringBuffer sb = new StringBuffer(8);
String cft = "abcdefg0123456789!#&%";
for (int i = 0; i < 8; i++) {
int k = (int) (Math.random() * 8);
sb.append(cft.charAt(k));
}
System.out.println(sb.toString());
}
}
package com.example;
public class RndomStrCreateDemo {
public static void main(String[] args) {
StringBuffer sb = new StringBuffer(8);
String cft = "abcdefg0123456789!#&%";
for (int i = 0; i < 8; i++) {
int k = (int) (Math.random() * 8);
sb.append(cft.charAt(k));
}
System.out.println(sb.toString());
}
}
package com.example;
public class RndomStrCreateDemo {
public static void main(String[] args) {
StringBuffer sb = new StringBuffer(8);
String cft = "abcdefg0123456789!#&%";
for (int i = 0; i < 8; i++) {
int k = (int) (Math.random() * 8);
sb.append(cft.charAt(k));
}
System.out.println(sb.toString());
}
}
結果下記
g0fc0fbf