public class XXK2 {

private int a,b;

public XXK2(int aa, int bb) {a=aa; b=bb;}

public int f1(int x) {

if(x>10) return a+b+3*x;

else return a*b*x;

}

public static void main(String[] args) {

XXK2 x=new XXK2(3,4);

int y=x.f1(8);      

System.out.println("y="+y);

}

}

public class XXK4 {

public static void main(String[] args) {

int []a={2,5,8,10,15,20};

int s=0;

for(int i=0; i<a.length; i++) s+=a[i];

System.out.println("s="+s);

}

}

public class XXK4 {

public static void main(String[] args) {

String []a={"xxk","weirong","xucong","xuxiaohua","baojuan"};

int m=0;

for(int i=0; i<a.length; i++) {

int n=a[i].length();

if(n>m) m=n;

}

System.out.println("m="+m);

}

}

Public class Test {

Public static void main(String［］ args) {

Vector teamList = new Vector();

teamList.add("Z");

teamList.add("L");

teamList.add("W");

teamList.remove(0);

teamList.remove(0);

System.out.println(teamList.size()+","+teamList.get(0));

}

}

class ABC {

int a,b;

public ABC(int a, int b) {this.a=a; this.b=b;}

public int compareTo(ABC x) {return a*b-x.a*x.b;}

}

public class XXK5 {

public static void main(String[] args) {

int [][]d={{3,8},{4,6},{5,6},{2,9},{6,7},{5,8}};

ABC []ar=new ABC[d.length];

int i,k=0;

for(i=0; i<ar.length; i++)

ar[i]=new ABC(d[i][0],d[i][1]);

for(i=1; i<ar.length; i++)

if(ar[i].compareTo(ar[k])>0) k=i;

System.out.println("k="+k);

}

}

class ABC {

String name;

double price;

public ABC(String na, double pr) {name=na; price=pr;}

public int compareTo(ABC x) {

if(name.compareTo(x.name)>0) return 1;

if(name.compareTo(x.name)<0) return -1;

else return 0;

}

}

public class XXK5 {

public static void main(String[] args) {

String []s={"apple", "pear", "tangerme", "banana", "grape"};

double []d={3.8, 2.5, 3.2, 4.3, 5.2};

ABC []ar=new ABC[s.length];

int i,k=0;

for(i=0; i<ar.length; i++)

ar[i]=new ABC(s[i],d[i]);

for(i=1; i<ar.length; i++)

if(ar[i].compareTo(ar[k])>0) k=i;

System.out.println(ar[k].name+" "+ar[k].price);

}

}

public class StackTest {

public static void main(String［］ args) {

Stack<Integer> st = new Stack<Integer>();

st.push(new Integer(11));

st.push(new Integer(22));

st.push(new Integer(33));

System.out.println("size is-> "+st.size());

System.out.println("Top is-> "+st.peek());

st.pop();

System.out.println("new Top is-> "+st.peek());

}

}

命题公式┐(P→Q)的主析取范式是P∨┐Q．(    ) 

命题公式┐P∧P的真值是T．(    )

命题公式P→(Q∨P)的真值是T．(    )

命题公式┐P∧(P→┐Q)∨P为永真式．(    ) 

文件ABC.mp3存放在F盘的T文件夹中，它的完整路径是F:\T\ABC.mp3。