d.txt

清华本科全套java课件 经典不用多说

//--------------0 方案1 ----------
// a.java文件：
import java.util.* ;
public class a {
  public static void main(String[] args){
    int i ;
    Random r = new Random();
    i = r.nextInt(10);
    System.out.println(i);
    System.out.println("--------------------------");
    Prime pm = new Prime(i*5);
    pm.print();
    System.out.println("--------------------------");
    pm.setLimit(pm.getLimit()+20);
    pm.print();
  }
}
// prime.java文件：
class Prime {
   int m_limit ;

   Prime(int in){
      m_limit=in ;
   }
   int getLimit(){
     return m_limit;
   }
   void setLimit(int x){
     m_limit = x ;
   }
   void print(){
     First_Loop:
     for(int i=2,k=0;i<=m_limit;i++){       
       for(int j=2;j<=Math.sqrt(i);j++) {
           if(i%j==0) continue First_Loop;  
       }
       System.out.print(i+"\t");
       k++;
       if(k%5==0) System.out.println();
     }
     System.out.println();
   }//end of  print()

}//class Prime

//--------------0 方案2 ----------
// b.java
import java.util.* ;
public class b {
  public static void main(String[] args){
    int i ;
    Random r = new Random();
    i = r.nextInt(10);
    System.out.println(i);
    System.out.println("--------------------------");
    Prime pm = new Prime(i*5);
    pm.print();
    System.out.println("--------------------------");
    pm.setLimit(pm.getLimit()+20);
    pm.print();
  }
}
class Prime {
   int m_limit ;

   Prime(int in){
      m_limit=in ;
   }
   int getLimit(){
     return m_limit;
   }
   void setLimit(int x){
     m_limit = x ;
   }
   void print(){
     First_Loop:
     for(int i=2,k=0;i<=m_limit;i++){       
       for(int j=2;j<=Math.sqrt(i);j++) {
           if(i%j==0) continue First_Loop;  
       }
       System.out.print(i+"\t");
       k++;
       if(k%5==0) System.out.println();
     }
     System.out.println();
   }//end of  print()

}//class Prime

//--------------0 方案3 ----------
import java.util.* ;
class c {
   int m_limit ;

   c(int in){
      m_limit=in ;
   }
   int getLimit(){
     return m_limit;
   }
   void setLimit(int x){
     m_limit = x ;
   }
   void print(){
     First_Loop:
     for(int i=2,k=0;i<=m_limit;i++){       
       for(int j=2;j<=Math.sqrt(i);j++) {
           if(i%j==0) continue First_Loop;  
       }
       System.out.print(i+"\t");
       k++;
       if(k%5==0) System.out.println();
     }
     System.out.println();
   }//end of  print()

   public static void main(String[] args){
     int i ;
     Random r = new Random();
     i = r.nextInt(10);
     System.out.println(i);
     System.out.println("--------------------------");
     c pm = new c(i*5);
     pm.print();
     System.out.println("--------------------------");
     pm.setLimit(pm.getLimit()+20);
     pm.print();
  }
}//class c

//--------------1-----------------
public class a
{    public static void main(String args[])   {
       int i=65;
       char c='a', cc='王';
       System.out.println(i);      	        //	65
       System.out.println((char)i);             //      A
       System.out.println(c);			//	a
       System.out.println((int)c);		//	97	
       System.out.println(cc);			//	王
       System.out.println((int)cc);             //  29579      ox738b
       System.out.println((char)24354);         //  张     0x5f20

       i=cc;
       System.out.println(i);
       System.out.println((char)i);
    }    
}

//------------------2----------------------
public class a
{      public static void main(String args[])   {
       Integer i=new Integer(256);
       Integer j=new Integer("256");

       System.out.println(i.intValue()*2);
       System.out.println(i.doubleValue());
       System.out.println("i= "+ i.toString());
       System.out.println(i==j);
       System.out.println(i.compareTo(j));

       System.out.println(Integer.parseInt("100") * 2);
       System.out.println("100*2= " + Integer.toString(100*2));
       int k ;
       k=Integer.valueOf("1010",2).intValue();
       System.out.println(k);

       System.out.println(Integer.MAX_VALUE);
       System.out.println(Integer.MIN_VALUE);
    }    
}

//-------------------------3---------------------------
public class a{
 public static void main(String[] args){
    int  m1 , m2 ;
    int[][] a  ;
    m1=5 ;  
    m2=10;
    a=new int[m1][m2];
    for(int i=0 ; i<5 ; i++)
       for(int j=0 ; j<10 ; j++)
          a[i][j] = i*j ;
    for(int i=0 ; i<a.length ; i++)    {
       for(int j=0 ; j<a[i].length ; j++)
                 System.out.print(a[i][j]+"  ");
       System.out.println("");
    }
  }
}

//------------------------4--------------------------
public class a{
 public static void main(String[] args){
   MyDate birth1,birth2 ;
   birth1 = new MyDate();
   birth1.day = 28 ;
   birth1.month = 12;
   birth1.year = 70 ;
   birth1.ps();
//   birth2.day = 30 ;

 }
}
class  MyDate {
  int  day ;
  int month ;
  int year ;
  void ps() {
   String s1,s2 ;
   s1="abc";s2="abc";
   if (s1==s2) System.out.println("-----1------");
   s1=new String("abc");
   s2=new String("abc");
   if (s1==s2) System.out.println("-----2------");
   if(s1.equals(s2)) System.out.println("-----3-----");

   s2=s1;
   s1=s1+"def";
   System.out.println("s1=" +s1 + "  "+ "s2="+s2);
   if(s1==s2) System.out.println("s1=s2");
  }
}

//-----------------------5------------------------
class a{
 public static void main(String[] args){

    System.out.println("Java与面向对象程序设计".length() );
    System.out.println("Java与面向对象程序设计".charAt(2) );
    System.out.println("Java与面向对象程序设计".charAt(6) );
    System.out.println("abcde".compareTo("abcfe"));
    System.out.println("abcde".compareTo("abcae"));
    System.out.println("abcde".compareTo("abe") );
    System.out.println("abcde".compareTo("abc") );
    int x = Integer.parseInt(args[0]);
    int y = Integer.parseInt(args[1]);
    System.out.println("x+y= "+ (x+y) );

 } 
}

//-----------------------6------------------------
// Java's "labeled" loop
public class labeled {
  public static void main(String[] args) {
	int i = 0;
	outer:					//标号定义outer
	while(true) {					   //外层循环
        prt("Outer loop top");       
		while(true) {				   //内层循环
          prt("inner loop top");       
          i++;
          prt("i = " + i );
          if(i == 1) continue;      //跳过本次循环，开始另一次循环
          if(i == 3) continue outer; //跳过outer所指的本次循环，开始另一次循环
          if(i == 5) break;          //跳过内层循环体
          if(i == 7) break outer;    //跳过outer所指的外层循环体
          prt("inner loop tail");       
        }
        prt("Outer loop tail");       
    }
  }

  static void prt(String s) {
      System.out.println(s);
  }
} 

//-----------------------7----------------------
public class a {
  public static void main(String[] args){
    Prime pm = new Prime(Integer.parseInt(args[0]));
    pm.print();
  }
}
class Prime {
   int m_limit ;

   Prime(int in){
      m_limit=in ;
   }

   void print(){
     First_Loop:
     for(int i=2,k=0;i<=m_limit;i++){       //i, k，出了循环体则无定义
	for(int j=2;j<=Math.sqrt(i);j++) {
          if(i%j==0) continue First_Loop;   //如果不是素数，对下一个进行检验
	}
	System.out.print(i+"\t");
	k++;
	if(k%5==0) System.out.println();
     }
   }//end of  print()
}//class