JavaTestCommon

01 ====================================================================================================

BigDecimal a = new BigDecimal("500.000");
BigDecimal b = new BigDecimal("300000");
System.out.println(a+b);

02 ====================================================================================================

String s1 = "String";
String s2 = new String("String");
String s3 = "String";
System.out.println(s1 == s2);
System.out.println(s1 == "String");
System.out.println(s1 == s3);
System.out.println(s1.equals(s2));

03 ====================================================================================================

private class myString extends String {
    public void sayHello () {
        System.out.println("Hello");
    }
}

04 ====================================================================================================

public class Item {
    int id;
    String name;
}

List<Item> list = new ArrayList();
// заполняем лист...
// как найти элемент с определенным name?

05 ====================================================================================================

long[] array = {1, 2, 3};
for (int x : array) {
    System.out.print(x);
}

06 ====================================================================================================

try {
    // do something
    return;
} catch (Exception e) {
    // do something
} finally {
    System.out.println("Finally block");
}

07 ====================================================================================================

try {
    // do something
    System.exit();
} catch (Exception e) {
    // do something
} finally {
    System.out.println("Finally block");
}

08 ====================================================================================================

public class Test {
    static {
        i = 5;
    }
    static int i = 6;

    public static void main(String[] args) {
        System.out.print(i);
    }
}

09 ====================================================================================================

private static class A {
    static int i = 1;
}

private static class B extends A {

}

A a = new A();
a.i = 2;
B b = new B();
System.out.println(b.i);