Java Code Review - ilya-khadykin/notes-outdated GitHub Wiki

This page was created in order to further investigate some of java code snippets I've come across, analyze them and fill gaps in my knowledge of java syntax.

Declarations

int[] a = {1,2,3,4,5};
int[] b = new int[5];
int c [] = {4,3,7};
int [] myScores [];
ClassName myClasses [];
boolean results[] = new boolean [] {true, false, true};

char c1 = 064770;
char c3 = 0xbeef;
char c6 = '\uface';

boolean b4 = new Boolean("false");

String s1 = null;

for(;;) {}

Passing the arguments

public class CommandArgs {
  public static void main(String[] args) {
    String s1 = args[1];
    String s2 = args[2];
    String s3 = args[3];
    String s4 = args[4];
    System.out.print(" args[2] = " + s2);
  }
}

// from CLI
// java CommandArgs 1 2 3 4 5

public class Test {
  static int s;
  public static void main(String[] args) {
    int I = 1;
    do while (I < 1)  // why this is valid?
    System.out.print("I is " + I);
    while (I > 1); // why this is valid?
  }
}

BigInteger two = BigInteger.valueOf(2);
BigInteger powerofTwo == two.pow(100);

BigDecimal one = BigDecimal.valueOf(1);
BigDecimal divisionResult = one.divide(new BigDecimal(powerofTwo));