java作业

class DataDemo01{
public static void main(String[] args){
int num=99999999999999999999999;

}
}

class DataDemo02{
public static void main(String[] args){
int max=Integer.MAX_VALUE;
System.out.println("整型的最大值："+max);
System.out.println("整型最大值+1："+(max+1));
System.out.println("整型最大值+2："+(max+2));
}
}

public class DataDemo03{
public static void main(String[] args){
int max=Integer.MAX_VALUE;
System.out.println("整型的最大值: "+max);
System.out.println("整型最大值 +1: "+(max+1));
System.out.println("整型最大值 +2: "+(max+2L));
System.out.println("整型最大值 +2: "+((long)max+2));
}
}

public class DataDemo04{
public static void main(String[] args){
char ch1='a';
char ch2=97;
System.out.println("ch1="+ch1);
System.out.println("ch2="+ch2);
}
}

public class DataDemo05{
public static void main(String[] args){
char ch1='\"';
char ch2='\\';
System.out.println("ch1= "+ch1);
System.out.println("ch2= "+ch2);
System.out.println("\"Hello World\"");
}
}

public class DataDemo06{
public static void main(String[] args){
float num=3.0f;
System.out.println("两个小数相乘: "+num * num);
}
}

public class DataDemo07{
public static void main(String[] args){
boolean flag=true;
System.out.println("flag= "+flag);
}
}