Scheduling algorithms in JAVA

fcfs.java

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+
+
+import java.io.*;
+import java.util.*;
+public class fcfs {
+	public static void main(String args[]) {
+               Scanner sc =new Scanner(System.in);
+		int[] pro = {1, 2, 3}, tat = new int[13], wt = new int[10];
+		int avgwt;
+		int total;
+		int n = (int)pro.length;
+		int avgtat;
+		int[] bust = {22, 3, 5};
+		System.out.println("-------------------");
+		System.out.println("pid\t bt");
+		System.out.println("--------------------");
+		for(int i = 0; i < n; i++) {
+			System.out.println((i + 1) + "\t " + bust[i] + "\t");
+		}
+		tat[0] = 0;
+		total = 0;
+		for(int i = 1; i < n + 1; i++) {
+			tat[i] = bust[i - 1] + tat[i - 1];
+			total = tat[i] + total;
+		}
+		System.out.println("total turn around time:" + total);
+		avgtat = total / 3;
+		System.out.println("average turnaround time=" + avgtat);
+		total = 0;
+		for(int i = 1; i < n + 1; i++) {
+			wt[i] = tat[i] - bust[i - 1];
+			total = total + wt[i];
+		}
+		System.out.println("total waiting time:" + total);
+		avgwt = total / 3;
+		System.out.println("avereage waiting time:" + avgwt);
+		System.out.println("finall ganttchart is:");
+		System.out.println("-------------------------------------------");
+		System.out.println("pid\t burst\t waiting\tturn around\t");
+		System.out.println("   \t time \time     \ttime     ");
+		System.out.println("-----------------------------------------------");
+		for(int i = 1; i < n + 1; i++) {
+			System.out.println(i + "\t " + bust[i - 1] + "\t " + wt[i] + "\t\t " + tat[i] + "\t");
+		}
+
+	}
+}

sjfs.java

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+import java.io.*;
+import java.util.*;
+public class sjfs {
+public static void main(String args[]) {
+ int pro[]={1,2,3};
+ int tat[] = new int[10];
+  int total;
+  int wt[] = new int[10];
+ int bust[]={10,5,2};
+ int i,j,temp;
+ int avgtat,avgwt;
+int n = (int)pro.length;
+ System.out.println(n);
+ System.out.print("-------------------\n");
+ System.out.println("pid\tbt\n");
+ System.out.println("--------------------\n");
+  for(i=0;i<n;i++)
+ {
+      System.out.println("\t"+(i+1)+"\t"+bust[i]);
+ }
+ for(i=0;i<n;i++)
+ {
+  for(j=0;j<n;j++)
+  {
+  if(bust[i]<bust[j])
+  {
+   temp=bust[i];
+   bust[i]=bust[j];
+   bust[j]=temp;
+  }
+ }
+}
+ tat[0]=0;
+ total=0;
+for(i=1;i<n+1;i++)
+{
+ tat[i]=bust[i-1]+tat[i-1];
+ total=total+tat[i];
+}
+System.out.println("total turnaround time:"+total);
+avgtat=(total)/3;
+System.out.println("average turnaround time:"+avgtat);
+total=0;
+for(i=3;i>0;i--)
+{
+ wt[i]=(tat[i]-bust[i-1]);
+ total=total+wt[i];
+}
+ System.out.println("total waitng time:"+total);
+ avgwt=(total)/3;
+ System.out.println("average waiting time:"+avgwt);
+ System.out.println("finall ganttchart is:");
+ System.out.print("-------------------------------------------\n");
+ System.out.println("pid\t burst\t waiting\tturn around\t\n");
+ System.out.println("   \t time \time     \ttime     \n");
+ System.out.println("-----------------------------------------------\n");
+ for(i=1;i<n+1;i++)
+ {
+    System.out.println(i+"\t"+bust[i-1]+"\t"+wt[i]+"\t"+tat[i]);
+  }
+ }
+}