Was sind die häufigsten Syntaxfehler bei der Verwendung von For-Schleifen in Java?

public class Forloop {
public static void main(String[] args) {
    for (int i = 1; i <= 4; i++) {
        for (int j = 1; j <= i; j++) {
            System.out.print(int j = Math.pow(j,i));
        }
    System.out.println();
    }
}

public static void main(final String[] args) {
    for (int i = 1; i <= 4; i++) {
        for (int j = 1; j <= i; j++) {
            System.out.print(Math.pow(j, i));
        }
        System.out.println();
    }
}

public static void main(final String[] args) {
    for (int i = 1; i <= 4; i++) {
        for (int j = 1; j <= i; j++) {
            int exp = (int) Math.pow(j, i);
            System.out.print(exp);
        }
        System.out.println();
    }
}

public static void main(final String[] args) {
    for (int i = 1; i <= 4; i++) {
        for (int j = 1; j <= i; j++) {
            System.out.print(j * j + " ");
        }
        System.out.println();
    }
}