java_homework1

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  1 package 基础题;
  2 
  3 public class Test1 {
  4     public static void main(String []args) {
  5         System.out.println("善学如春起之苗");
  6         System.out.println("不见其增,日有所长");
  7         System.out.println("假学如磨刀之石");
  8         System.out.println("不见其损,年有所亏");
  9         System.out.println("加油吧!少年");
 10         System.out.println("J");
 11         System.out.println("A");
 12         System.out.println("V");
 13         System.out.println("A");
 14         System.out.println("!");
 15         
 16     }
 17 
 18 }
 19 package 基础题;
 20 
 21 public class Test2 {
 22     public static void main(String[] args) {
 23         // TODO Auto-generated method stub
 24         int[] x = {-2147483648,-100,0,100,2147483647};
 25         double[] y= {-100.0,-10.0,0.0,10.9,100.9};
 26         for(int i=0;i<x.length;i++) {
 27             System.out.println(x[i]);
 28         }
 29         for(int i=0;i<y.length;i++) {
 30             System.out.println(y[i]);
 31         }
 32     }
 33 }
 34 package 基础题;
 35 
 36 public class Test3 {
 37 
 38     public static void main(String[] args) {
 39         // TODO Auto-generated method stub
 40         boolean[] x = {true,false};
 41         for(boolean ele : x) {
 42             System.out.println(ele);
 43         }
 44     }
 45 
 46 }
 47 package 基础题;
 48 
 49 public class Test4 {
 50 
 51     public static void main(String[] args) {
 52         // TODO Auto-generated method stub
 53         byte x = -128;
 54         byte y = 127;
 55         System.out.println(x);
 56         System.out.println(y);
 57         short x1 = -32768;
 58         short y1 = 32467;
 59         System.out.println(x1);
 60         System.out.println(y1);
 61         int x2 = -2147483648;
 62         int y2 = 2147483647;
 63         long x3 = -21483649;
 64         long x4 = 21483648;
 65         System.out.println(x2);
 66         System.out.println(y2);
 67         
 68 
 69     }
 70 
 71 }
 72 package 基础题;
 73 
 74 public class Test5 {
 75 
 76     public static void main(String[] args) {
 77         // TODO Auto-generated method stub
 78         float x = -3.14f;
 79         float y = 3.14f;
 80         System.out.println(x);
 81         System.out.println(y);
 82 
 83     }
 84 
 85 }
 86 package 基础题;
 87 
 88 public class Test6 {
 89 
 90     public static void main(String[] args) {
 91         // TODO Auto-generated method stub
 92         char[] x = {'9','J','a',' ','@'};
 93         boolean[] y= {true,false};
 94         for(int i=0;i<x.length;i++) {
 95             System.out.println(x[i]);
 96         }
 97         for(boolean ele : y) {
 98             System.out.println(ele);
 99         }
100     }
101 
102 }
103 package 基础题;
104 
105 public class Test7 {
106 
107     public static void main(String[] args) {
108         // TODO Auto-generated method stub
109         int a =10;  
110         int b =20;
111         int temp; // 交换的杯子
112         {
113             temp =a;
114             a =b;
115             b =temp;
116         }
117         System.out.println("a ="+a+", b="+b);
118     }
119 
120 }
121 package 扩展题目;
122 
123 public class Test8 {
124 
125     public static void main(String[] args) {
126         // 四则运算
127         java.util.Scanner in = new java.util.Scanner(System.in);
128         System.out.println("请输入两个数: ");
129         int x = in.nextInt();
130         int y = in.nextInt();
131         System.out.println("x+y= "+ (x+y));
132         System.out.println("x-y= "+ (x-y));
133         System.out.println("x*y= "+ (x*y));
134         if(y!=0) {
135             System.out.println("x/y= "+ ((double)x/y));
136         }
137         else {
138             System.out.println("在除法中分母不能为0");
139         }
140     }
141 
142 }

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