public class BooleanTest {
   static boolean test1(int val) {
        System.out.println("test1("+ val +")");
        System.out.println("result: " + (val < 10));
        return val < 10;
    }

    static boolean test2(int val) {
        System.out.println("test2("+ val +")");
        System.out.println("result: " + (val < 20));
        return val < 20;
    }

    static boolean test3(int val) {
        System.out.println("test3("+ val +")");
        System.out.println("result: " + (val < 30));
        return val < 30;
    }

    public static void main(String[] args) {
       if(test1(0) && test2(20) && test3(20))
           System.out.println("Expression is true");
       else
           System.out.println("Expression is false");
    }
}