DESKTOP-8DEPNOJ_20200831-郭时佐

问题

求孪生素数问题

解答

package nhxz;

public class Su {
public String apple() {
String s = "";
for (int x = 2; x < 1000; x++) {
if (this.appleTest(x) && this.appleTest(x + 2)) {
s += x + "和" + (x + 2) + ";";
}
}
return s;
}

public boolean appleTest(int x) {
    for (int t = 2; t < x; t++) {
        if (x % t == 0) {
            return false;
        }
    }
    return true;
}

public static void main(String[] args) {
    Su a = new Su();
    String x = a.apple();
    System.out.println(x);
}

}

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