Java 程序设计 编程 实例 初步学习.doc

Java 程序设计 编程 实例 初步学习public class Accumulator public int add(int a,int b) return a+b; public int sub(int a,int b) return a-b; public int mul(int a,int b) return a*b; public int div(int a,int b) return a/b; public int mod(int a,int b) return a%b; public int zhi(int a,int b) return ab; public static void main(String args) Accumulator acc=new Accumulator(); int a,s,m,d,o,z; a= acc.add(9,5); s=acc.sub(9,5); m= acc.mul(9,5); d=acc.div(9,5); o=acc.mod(9,5); z= acc.zhi(2,5); System.out.println(a+ +s+ +m+ +d+ +o+ +z); import java.applet.*;import java.awt.*;public class Boy extends Applet public void paint(Graphics g) g.setColor(Color.red); g.drawString(我自横刀向天笑,10,30); g.setColor(Color.blue); g.drawString(笑完我就去睡觉,10,50); public class CompareExample public static void main(String args) int a=9,b=5,c=7,t; if(ab) t=a; a=b; b=t; if(ac) t=a; a=c; c=t; if(bc) t=b; b=c; c=t; System.out.println(a=+a+,b=+b+,c=+c); public class E2 public static void main(String args) long a=1,2,3,4; long b=100,200,300,400,500; b=a; System.out.println(数组b的长度:+b.length); System.out.println(b0=+b0); public class E3 public static void main(String args) for(int i=20302;i=20322;i+) System.out.println(char)i); public class Ewz public static void main(String args) int c=2200; long d=8000; float f; double g=123456789.123456789; c=(int)d; f=(float)g; System.out.print(c= +c); System.out.println( d= +d); System.out.println(f= +f); System.out.println(g= +g); public class Ex1 public static void main(String args) int a=100,200,300; int b=10,11,12,13,14,15,16; b=a; b0=123456; System.out.println(数组a:+a0+,+a1+,+a2); System.out.println(数组b:+b0+,+b1+,+b2); System.out.println(数组b的长度:+b.length); public class Example public static void main(String args) char cW=你,jW=; int p1=36328,p2=38358; System.out.println(汉字你在unicode表中的顺序位置:+(char)cW); System.out.println(日语在unicode表中的顺序位置:+(char)jW); System.out.println(unicode表中第+p1+位置上的字符是:+(char)p1); System.out.println(unicode表中第+p2+位置上的字符是:+(char)p2); public class Testpublic int add(int a,int b) return a+b;public int sub(int a,int b) return a-b;public int mul(int a,int b) return a*b;public int div(int a,int b) return a/b;public void outprint() System.out.println(welcome to java world);public void method(int a) if(a10) return; System.out.println(Hello Jerry); public static void main(String args) Test test=new Test(); int x=8; int y=3; int a=test.add(x,y); int b=test.sub(x,y); int c=test.mul(x,y); int d=test.div(x,y); System.out.println( +a+ +b+ +c+ +d+); test.outprint(); test.method(15); / 1/1!+1/2!+1/3!+1/4!+1/19!+1/20!public class Example12 public static void main(String args) double sum1=0,sum2=0,a=1,b=1; int i=1; while(i=20) sum1+=a; i+; a*=(1.0/i); for(i=1;i=20;i+) sum2+=b; b*=(1.0/(i+1); System.out.println(sum1=+sum1+n+sum2=+sum2); public class Example13 public static void main(String args) int sum=0,i,j; for(i=1;i=10;i+) if(i%2=0) continue; sum+=i; System.out.println(sum=+sum); /计算1+3+5+7+9 for(j=2;j=50;j+) for(i=2;ij/2) System.out.println(j);/求50以内的素数 public class Example14 public static void main(String args) char x=你,y=情,z=吃; if(xA) y=爱; z=情; else y=我; z=她; System.out.println( +x+y+z); public class Example15 public static void main(String args) char c=0; for(int i=1;i=4;i+) switch(i) case 1: c=b; System.out.print(c); case 2: c=e; System.out.print(c); break; case 3: c=p; System.out.print(c); default: System.out.print(!); public class ExampleSwitch public static void main(String args) int x=85,y=10; switch(x/y) case 10: case 9: System.out.println(90=x=100); break; case 8: case 7: case 6: System.out.println(60=x90); break; case 5: case 4: case 3: case 2: case 1: case 0: System.out.println(0=x60); break; default: System.out.println(x0); package ;public class he public static void main(String args) int sum=0; for(int i=1;i=100;i+) sum+=i; System.out.println(sum); public class Hello public static void main(String args) System.out.println(Hello JAVA!); public class Maopao public static void main(String args) int i,j,t; int a=9,24,34,11,60,13,2,78,44; for(i=1;i=9;i+) for(j=0;jaj+1) t=aj; aj=aj+1; aj+1=t; for(i=0;i60) System.out.println(math is passed.); else System.out.println(math is not passed.); if(english90) System.out.println(english is very good.); else System.out.println(english is general.); System.out.println(我在学习控制语句。); System.out.println(); System.out.println(); System.out.println(); System.out.println(); for(i=1;i10;i+) for(j=1;j=i;j+) if(j=2&(i=3|i=4) System.out.print(j+i+=+i*j+ ); else System.out.print(j+i+=+i*j+ ); System.out.println(); public class OutputData public static void main(String args) int x=234,y=432; System.out.println(x+(2*x); System.out.print(我输出结果后不回车); System.out.println(我输出结果后自动回车到下一行); System.out.println(x+y= +(x+y); System.out.println( +x+y+=234432); public class ParamTest public static void main(String args) Person person=new Person(); person.change(person); int age=person.age; System.out.println(age); System.out.println(-); int i=10; person.change2(i); System.out.println(i); class Person int age=20; public void change(Person person) person=new Person(); person.age=30; public void change2(int age) age=40; public class Testpublic int add(int a,int b) return a+b;public int sub(int a,int b) return a-b;public int mul(int a,int b) return a*b;public int div(int a,int b) return a/b;public void outprint() System.out.println(welcome to java world);public void method(int a) if(a10) return; System.out.println(Hello Jerry); public static void main(String args) Test test=new Test(); int x=8; int y=3; int a=test.add(x,y);