package net.mindview.util;public class Print {/*** 不带有回车* @param s*/public static void print(Object s){System.out.print(s);}/*** 带有回车* @param s*/public static void println(Object s){System.out.println(s);}
}

package net.mindview.operators;import java.util.Date;
import static net.mindview.util.Print.*;
public class HelloData {public static void main(String[] args) {print("hello, it is");print(new Date());System.out.println("正常的方式打印");}
}

package net.mindview.operators;class Tank{int level;
}public class Assignment {public static void main(String[] args) {Tank t1 = new Tank();Tank t2 = new Tank();t1.level = 27;t2.level = 41;System.out.println("t1.level:" + t1.level + ", t2.level:" + t2.level);t2 = t1;System.out.println("t1.level:" + t1.level + ", t2.level:" + t2.level);t1.level = 5;System.out.println("t1.level:" + t1.level + ", t2.level:" + t2.level);}}

package net.mindview.operators;class Letter{char c;
}public class PassObject {static void  f(Letter y){y.c = 'z';}public static void main(String[] args) {Letter x = new Letter();x.c = 'a';System.out.println("1: x.c="+x.c);//传递的时x所指向的引用
        f(x);System.out.println("1: x.c="+x.c);}
}

package net.mindview.operators;class Dog{public String name;public String says;@Overridepublic String toString() {return "名字:"+this.name + ",语言:"+this.says;}
}
public class DogTest {public static void main(String[] args) {// TODO Auto-generated method stubDog d1 = new Dog();Dog d2 = new Dog();d1.name = "spot";d1.says = "Ruff!";d2.name = "scruffy";d2.says = "Wurf!";System.out.println(d1);System.out.println(d2);}
}

package net.mindview.operators;class Dog{public String name;public String says;@Overridepublic String toString() {return "名字:"+this.name + ",语言:"+this.says;}
}
public class DogTest {public static void main(String[] args) {// TODO Auto-generated method stubDog d1 = new Dog();Dog d2 = new Dog();d1.name = "spot";d1.says = "Ruff!";d2.name = "scruffy";d2.says = "Wurf!";System.out.println(d1);System.out.println(d2);Dog d3 = new Dog();d3.name = "spot";System.out.println(d1.name == d3.name);System.out.println(d1.name.equals(d3.name));}
}

名字:spot,语言:Ruff!
名字:scruffy,语言:Wurf!
true
true

package net.mindview.operators;import java.util.Random;
import static net.mindview.util.Print.*;
public class ThrowCron {public static void main(String[] args) {Random num = new Random();int a = num.nextInt(100);switch (a % 2){ case 0:println("正面"); break;case 1:println("反面");break;}}}