金陵科技学院java面向对象实验报告第一章

终于辛苦写完作业了，大家借鉴借鉴，不要直接抄袭，违背了我发博客的本意。

正文

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1、Hello.java
public class Hello
{
    public static void main(String args[])
    {
        System.out.println("Hello!");
    }
}

2、HelloApplet.java
import java.awt.*;
import java.applet.Applet;
public class HelloApplet extends Applet
{
    public void paint(Graphics g)
    {
        g.setColor(Color.red);
        g.drawString("Hello!",20,20);
    }
}

3、Score.java
import java.util.Scanner;
public class Score {
	public static void main(String args[]) {
			while(true) 
			{
			int score;
			char grade;
			System.out.println("请输入成绩");
			Scanner reader=new Scanner (System.in);
			score=reader.nextInt();
			while ((score>100)||(score<0))
			{
				System.out.println("请重新输入成绩（0-100）");
				score=reader.nextInt();
			}
			switch(score/10) {
			case 10:
			case 9:grade='A';break;
			case 8:grade='B';break;
			case 7:grade='C';break;
			case 6:grade='D';break;
			default:grade='E';
			}
			System.out.println("等级为"+grade);
			}	
	}
}

4、test_4.java
public class test_4 {
	public static void main(String[]  args) {
	int i,j,k;
	k=0;
	int prime[];
	prime = new int[20];
	for(i=200;i<=300;i++)
	{
		for(j=2;j<=i/2;j++)
		{
			if(i%j==0)
				break;
		}
		if(j>i/2)
		{
			prime[k++] = i;
		}
	}
	for (int y=1;y<prime.length;y++) {
		System.out.print(prime[y-1]+" ");
		if (y%10==0)
			System.out.println("\n");
	}
	}
}

5、test_5.java
public class test_5 {
	public static void main(String[] args) {
	int i,j,n=4;
	//第一个
	int a[][] = new int[n][n];
	for(i=0;i<a.length;i++) {
		for(j=0;j<a[i].length;j++) {
			if(i<=j) a[i][j]=i;
			if(i>=j) a[i][j]=j;
		}
	}
	//第二个
	int b[][] = new int[n][];
	int len;
	for(i=0;i<b.length;i++) {
		len = (i+1)*2-1;
		b[i] = new int[len];
		b[i][i]=i+1;
		for(j=0;j<b[i].length;j++) {
			for(int k=1;k<=i;k++)
			{
				b[i][i+k]=b[i][i-k]=i+1-k;
			}
		}
	}
	print (a);
	System.out.println();
	for(i=0;i<b.length;i++)
	{
		for(int k=0;k<3-i;k++)
			System.out.print("  ");
		for(j=0;j<b[i].length;j++)
		{
			System.out.print(b[i][j]+" ");
		}
		System.out.println();
	}
	
}
	static void print(int c[][])
	{
		for(int [] row:c) {
			for(int col:row)
				System.out.print(col+" ");
			System.out.println();
		}
	}
}

6、test_6.java
public class test_6 {
	public static void main(String[] args) {
		int a[][] = {{1,2,11},{4,5,12},{7,8,9}};
		int i,j;
	    int maxInRow=0,maxColumn = 0,raw = 0;
	    int minInColumn=0, tempRaw=0;
	    for(i=0;i<3;i++){
	        maxInRow = a[i][0];//假定每行的最大值是第一个元素
	        //找出每行的最大值
	        for(j=0;j<3;j++){
	            if(maxInRow<=a[i][j]){
	            maxInRow = a[i][j];
	            maxColumn = j;
	            raw = i;
	            }
	        }
	    minInColumn = a[0][maxColumn];
	    //找出上一个循环最大数所在列的最大数的行数
	        for(j=0;j<3;j++){
	            if(minInColumn>=a[j][maxColumn]){
	                minInColumn = a[j][maxColumn];
	                tempRaw = j;
	            }
	        }
	        //上边两个条件分别找出了行中最大数所在的列,找出此列中最小的数所在的行
	        if(raw == tempRaw){
	              System.out.println("第"+(raw+1)+"行"+(maxColumn+1)+"列有靶点"+a[raw][maxColumn]);
	        }else{
	        	System.out.println("第"+(raw+1)+"行没有靶点");
	        }
	    }
	    System.out.println();
		for(int [] row:a) {
			for(int col:row)
				System.out.print(col+" ");
			System.out.println();
		}
}
}

7、test_7.java
public class test_7 {
	public static void main(String[] args) {
				String s1 = "This is the second string.";
				String s2 = "This is the second string.";
				String s3 = new String("This is the second string.");
				String s4 = new String(s1);
				String s5 = s1;
				boolean result121 = s1.equals(s2);
				boolean result122 = s1 == s2;
				boolean result131 = s1.equals(s3);
				boolean result132 = s1 == s3;
				boolean result141 = s1.equals(s4);
				boolean result142 = s1 == s4;
				boolean result151 = s1.equals(s5);
				boolean result152 = s1 == s5;
				System.out.println("s1 equals s2= " +result121); 
				System.out.println("s1 == s2= " +result122);     
				System.out.println("s1 equals s3= " +result131);  
				System.out.println("s1 == s3= " +result132);     
				System.out.println("s1 equals s4= " +result141);  
				System.out.println("s1 == s4= " +result142);    
				System.out.println("s1 equals s5= " +result151); 
				System.out.println("s1 == s5= " +result152);     
	}
}

8、test_8.java
import java.util.Scanner;
public class test_8 {
	public static void main(String[] args) {
	while(true) {
		int i,j;
		j=0;
		Scanner reader = new Scanner(System.in);
		System.out.println("请输入字符串");
		String s1 = reader.nextLine();
		char a1[] = new char[s1.length()];
		char a2[] = new char[s1.length()];
		//反向
		for(i=s1.length()-1;i>=0;i--)
		{
			a1[j++] = s1.charAt(i);
		}
		//正向
		j=0;
		for(i=0;i<s1.length();i++)
		{
			a2[j++] = s1.charAt(i);
		}
		for(i=0;i<s1.length();i++)
		{
			if(a1[i]==a2[i])
				continue;
			else
			{
				System.out.println("不是回文数");
				break;
			}
		}
		if(i==s1.length())
			System.out.println("是回文数");
	}
	}
}

9、test_9.java
public class test_9 {
	public static void main(String[] args) {
		String a[]= {"melon","apple","pear","banana"};
		String t = null;	
		int flag;
		for(int i=0;i<4;i++)
			for(int j=i+1;j<4;j++)
			{
				flag = a[i].compareTo(a[j]);
				if(flag>0) {
					t=a[i];a[i]=a[j];a[j]=t;
				}	
			}
		for(int i=0;i<4;i++)
			System.out.println(a[i]);
		
	}
}