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public void evaluate(){
        int a[]={1,2,3,4,5};
        int d[]=a;
        int sum=0;
        for(int j=0;j<3;++j)
            sum+=(a[j]*d[j+1]) + (a[j+1]*d[j]);
        System.out.println(sum);
    }
 

Main.java:1: error: class, interface, or enum expected
public void evaluate(){
       ^
Main.java:3: error: class, interface, or enum expected
        int d[]=a;
        ^
Main.java:4: error: class, interface, or enum expected
        int sum=0;
        ^
Main.java:5: error: class, interface, or enum expected
        for(int j=0;j<3;++j)
        ^
Main.java:5: error: class, interface, or enum expected
        for(int j=0;j<3;++j)
                    ^
Main.java:5: error: class, interface, or enum expected
        for(int j=0;j<3;++j)
                        ^
Main.java:7: error: class, interface, or enum expected
        System.out.println(sum);
        ^
Main.java:8: error: class, interface, or enum expected
    }
    ^
8 errors

Standard output is empty